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 | |
85 | * @media_addr: media address to use when sending messages over link | |
86 | * @timer: link timer | |
87 | * @net: pointer to namespace struct | |
88 | * @refcnt: reference counter for permanent references (owner node & timer) | |
89 | * @peer_session: link session # being used by peer end of link | |
90 | * @peer_bearer_id: bearer id used by link's peer endpoint | |
91 | * @bearer_id: local bearer id used by link | |
92 | * @tolerance: minimum link continuity loss needed to reset link [in ms] | |
38206d59 JPM |
93 | * @abort_limit: # of unacknowledged continuity probes needed to reset link |
94 | * @state: current state of link FSM | |
95 | * @peer_caps: bitmap describing capabilities of peer node | |
96 | * @silent_intv_cnt: # of timer intervals without any reception from peer | |
97 | * @proto_msg: template for control messages generated by link | |
98 | * @pmsg: convenience pointer to "proto_msg" field | |
99 | * @priority: current link priority | |
100 | * @net_plane: current link network plane ('A' through 'H') | |
35c55c98 | 101 | * @mon_state: cookie with information needed by link monitor |
38206d59 JPM |
102 | * @backlog_limit: backlog queue congestion thresholds (indexed by importance) |
103 | * @exp_msg_count: # of tunnelled messages expected during link changeover | |
104 | * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset | |
105 | * @mtu: current maximum packet size for this link | |
106 | * @advertised_mtu: advertised own mtu when link is being established | |
107 | * @transmitq: queue for sent, non-acked messages | |
108 | * @backlogq: queue for messages waiting to be sent | |
109 | * @snt_nxt: next sequence number to use for outbound messages | |
38206d59 JPM |
110 | * @ackers: # of peers that needs to ack each packet before it can be released |
111 | * @acked: # last packet acked by a certain peer. Used for broadcast. | |
112 | * @rcv_nxt: next sequence number to expect for inbound messages | |
113 | * @deferred_queue: deferred queue saved OOS b'cast message received from node | |
114 | * @unacked_window: # of inbound messages rx'd without ack'ing back to peer | |
115 | * @inputq: buffer queue for messages to be delivered upwards | |
116 | * @namedq: buffer queue for name table messages to be delivered upwards | |
117 | * @next_out: ptr to first unsent outbound message in queue | |
118 | * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate | |
119 | * @long_msg_seq_no: next identifier to use for outbound fragmented messages | |
120 | * @reasm_buf: head of partially reassembled inbound message fragments | |
121 | * @bc_rcvr: marks that this is a broadcast receiver link | |
122 | * @stats: collects statistics regarding link activity | |
a99df449 RD |
123 | * @session: session to be used by link |
124 | * @snd_nxt_state: next send seq number | |
125 | * @rcv_nxt_state: next rcv seq number | |
126 | * @in_session: have received ACTIVATE_MSG from peer | |
127 | * @active: link is active | |
128 | * @if_name: associated interface name | |
129 | * @rst_cnt: link reset counter | |
130 | * @drop_point: seq number for failover handling (FIXME) | |
131 | * @failover_reasm_skb: saved failover msg ptr (FIXME) | |
132 | * @failover_deferdq: deferred message queue for failover processing (FIXME) | |
133 | * @transmq: the link's transmit queue | |
134 | * @backlog: link's backlog by priority (importance) | |
135 | * @snd_nxt: next sequence number to be used | |
136 | * @rcv_unacked: # messages read by user, but not yet acked back to peer | |
137 | * @deferdq: deferred receive queue | |
138 | * @window: sliding window size for congestion handling | |
139 | * @min_win: minimal send window to be used by link | |
140 | * @ssthresh: slow start threshold for congestion handling | |
141 | * @max_win: maximal send window to be used by link | |
142 | * @cong_acks: congestion acks for congestion avoidance (FIXME) | |
143 | * @checkpoint: seq number for congestion window size handling | |
144 | * @reasm_tnlmsg: fragmentation/reassembly area for tunnel protocol message | |
145 | * @last_gap: last gap ack blocks for bcast (FIXME) | |
146 | * @last_ga: ptr to gap ack blocks | |
147 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
148 | * @bc_sndlink: the namespace global link used for broadcast sending | |
149 | * @nack_state: bcast nack state | |
150 | * @bc_peer_is_up: peer has acked the bcast init msg | |
38206d59 JPM |
151 | */ |
152 | struct tipc_link { | |
153 | u32 addr; | |
154 | char name[TIPC_MAX_LINK_NAME]; | |
38206d59 JPM |
155 | struct net *net; |
156 | ||
157 | /* Management and link supervision data */ | |
7ea817f4 JM |
158 | u16 peer_session; |
159 | u16 session; | |
9012de50 JM |
160 | u16 snd_nxt_state; |
161 | u16 rcv_nxt_state; | |
38206d59 JPM |
162 | u32 peer_bearer_id; |
163 | u32 bearer_id; | |
164 | u32 tolerance; | |
38206d59 JPM |
165 | u32 abort_limit; |
166 | u32 state; | |
167 | u16 peer_caps; | |
7ea817f4 | 168 | bool in_session; |
38206d59 JPM |
169 | bool active; |
170 | u32 silent_intv_cnt; | |
e74a386d | 171 | char if_name[TIPC_MAX_IF_NAME]; |
38206d59 JPM |
172 | u32 priority; |
173 | char net_plane; | |
35c55c98 | 174 | struct tipc_mon_state mon_state; |
88e8ac70 | 175 | u16 rst_cnt; |
38206d59 JPM |
176 | |
177 | /* Failover/synch */ | |
178 | u16 drop_point; | |
179 | struct sk_buff *failover_reasm_skb; | |
58ee86b8 | 180 | struct sk_buff_head failover_deferdq; |
38206d59 JPM |
181 | |
182 | /* Max packet negotiation */ | |
183 | u16 mtu; | |
184 | u16 advertised_mtu; | |
185 | ||
186 | /* Sending */ | |
187 | struct sk_buff_head transmq; | |
188 | struct sk_buff_head backlogq; | |
189 | struct { | |
190 | u16 len; | |
191 | u16 limit; | |
e95584a8 | 192 | struct sk_buff *target_bskb; |
38206d59 JPM |
193 | } backlog[5]; |
194 | u16 snd_nxt; | |
38206d59 JPM |
195 | |
196 | /* Reception */ | |
197 | u16 rcv_nxt; | |
198 | u32 rcv_unacked; | |
199 | struct sk_buff_head deferdq; | |
200 | struct sk_buff_head *inputq; | |
201 | struct sk_buff_head *namedq; | |
202 | ||
203 | /* Congestion handling */ | |
204 | struct sk_buff_head wakeupq; | |
16ad3f40 JM |
205 | u16 window; |
206 | u16 min_win; | |
207 | u16 ssthresh; | |
208 | u16 max_win; | |
209 | u16 cong_acks; | |
210 | u16 checkpoint; | |
38206d59 JPM |
211 | |
212 | /* Fragmentation/reassembly */ | |
213 | struct sk_buff *reasm_buf; | |
2320bcda | 214 | struct sk_buff *reasm_tnlmsg; |
38206d59 JPM |
215 | |
216 | /* Broadcast */ | |
217 | u16 ackers; | |
218 | u16 acked; | |
d7626b5a TL |
219 | u16 last_gap; |
220 | struct tipc_gap_ack_blks *last_ga; | |
38206d59 JPM |
221 | struct tipc_link *bc_rcvlink; |
222 | struct tipc_link *bc_sndlink; | |
7c4a54b9 | 223 | u8 nack_state; |
38206d59 JPM |
224 | bool bc_peer_is_up; |
225 | ||
226 | /* Statistics */ | |
227 | struct tipc_stats stats; | |
228 | }; | |
229 | ||
2cf8aa19 EH |
230 | /* |
231 | * Error message prefixes | |
232 | */ | |
6e498158 | 233 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 234 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 235 | |
52666986 JPM |
236 | /* Send states for broadcast NACKs |
237 | */ | |
238 | enum { | |
239 | BC_NACK_SND_CONDITIONAL, | |
240 | BC_NACK_SND_UNCONDITIONAL, | |
241 | BC_NACK_SND_SUPPRESS, | |
242 | }; | |
243 | ||
53962bce | 244 | #define TIPC_BC_RETR_LIM (jiffies + msecs_to_jiffies(10)) |
382f598f | 245 | #define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1)) |
7c4a54b9 | 246 | |
662921cd | 247 | /* Link FSM states: |
b97bf3fd | 248 | */ |
d3504c34 | 249 | enum { |
662921cd JPM |
250 | LINK_ESTABLISHED = 0xe, |
251 | LINK_ESTABLISHING = 0xe << 4, | |
252 | LINK_RESET = 0x1 << 8, | |
253 | LINK_RESETTING = 0x2 << 12, | |
254 | LINK_PEER_RESET = 0xd << 16, | |
255 | LINK_FAILINGOVER = 0xf << 20, | |
256 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
257 | }; |
258 | ||
259 | /* Link FSM state checking routines | |
260 | */ | |
662921cd | 261 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 262 | { |
662921cd | 263 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 264 | } |
b97bf3fd | 265 | |
d999297c JPM |
266 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
267 | struct sk_buff_head *xmitq); | |
426cc2b8 | 268 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
269 | bool probe_reply, u16 rcvgap, |
270 | int tolerance, int priority, | |
426cc2b8 | 271 | struct sk_buff_head *xmitq); |
1a90632d | 272 | static void link_print(struct tipc_link *l, const char *str); |
e0a05ebe JPM |
273 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
274 | struct sk_buff_head *xmitq); | |
52666986 JPM |
275 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
276 | struct sk_buff_head *xmitq); | |
d7626b5a TL |
277 | static u8 __tipc_build_gap_ack_blks(struct tipc_gap_ack_blks *ga, |
278 | struct tipc_link *l, u8 start_index); | |
279 | static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr); | |
280 | static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r, | |
281 | u16 acked, u16 gap, | |
6a6b5c8b | 282 | struct tipc_gap_ack_blks *ga, |
d7626b5a TL |
283 | struct sk_buff_head *xmitq, |
284 | bool *retransmitted, int *rc); | |
16ad3f40 JM |
285 | static void tipc_link_update_cwin(struct tipc_link *l, int released, |
286 | bool retransmitted); | |
b97bf3fd | 287 | /* |
05790c64 | 288 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 289 | */ |
662921cd | 290 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 291 | { |
662921cd JPM |
292 | return link_is_up(l); |
293 | } | |
294 | ||
c8199300 JPM |
295 | bool tipc_link_peer_is_down(struct tipc_link *l) |
296 | { | |
297 | return l->state == LINK_PEER_RESET; | |
298 | } | |
299 | ||
662921cd JPM |
300 | bool tipc_link_is_reset(struct tipc_link *l) |
301 | { | |
302 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
303 | } | |
304 | ||
73f646ce JPM |
305 | bool tipc_link_is_establishing(struct tipc_link *l) |
306 | { | |
307 | return l->state == LINK_ESTABLISHING; | |
308 | } | |
309 | ||
662921cd JPM |
310 | bool tipc_link_is_synching(struct tipc_link *l) |
311 | { | |
312 | return l->state == LINK_SYNCHING; | |
313 | } | |
314 | ||
315 | bool tipc_link_is_failingover(struct tipc_link *l) | |
316 | { | |
317 | return l->state == LINK_FAILINGOVER; | |
318 | } | |
319 | ||
320 | bool tipc_link_is_blocked(struct tipc_link *l) | |
321 | { | |
322 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
323 | } |
324 | ||
742e0383 | 325 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
326 | { |
327 | return !l->bc_sndlink; | |
328 | } | |
329 | ||
742e0383 | 330 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
331 | { |
332 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
333 | } | |
334 | ||
c72fa872 JPM |
335 | void tipc_link_set_active(struct tipc_link *l, bool active) |
336 | { | |
337 | l->active = active; | |
b97bf3fd PL |
338 | } |
339 | ||
38206d59 JPM |
340 | u32 tipc_link_id(struct tipc_link *l) |
341 | { | |
342 | return l->peer_bearer_id << 16 | l->bearer_id; | |
343 | } | |
344 | ||
16ad3f40 | 345 | int tipc_link_min_win(struct tipc_link *l) |
38206d59 | 346 | { |
16ad3f40 JM |
347 | return l->min_win; |
348 | } | |
349 | ||
350 | int tipc_link_max_win(struct tipc_link *l) | |
351 | { | |
352 | return l->max_win; | |
38206d59 JPM |
353 | } |
354 | ||
355 | int tipc_link_prio(struct tipc_link *l) | |
356 | { | |
357 | return l->priority; | |
358 | } | |
359 | ||
360 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
361 | { | |
362 | return l->tolerance; | |
363 | } | |
364 | ||
365 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
366 | { | |
367 | return l->inputq; | |
368 | } | |
369 | ||
370 | char tipc_link_plane(struct tipc_link *l) | |
371 | { | |
372 | return l->net_plane; | |
373 | } | |
374 | ||
9012de50 JM |
375 | void tipc_link_update_caps(struct tipc_link *l, u16 capabilities) |
376 | { | |
377 | l->peer_caps = capabilities; | |
378 | } | |
379 | ||
52666986 JPM |
380 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
381 | struct tipc_link *uc_l, | |
382 | struct sk_buff_head *xmitq) | |
2f566124 | 383 | { |
52666986 JPM |
384 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
385 | ||
386 | snd_l->ackers++; | |
387 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 388 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 389 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
390 | } |
391 | ||
52666986 JPM |
392 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
393 | struct tipc_link *rcv_l, | |
394 | struct sk_buff_head *xmitq) | |
2f566124 | 395 | { |
52666986 JPM |
396 | u16 ack = snd_l->snd_nxt - 1; |
397 | ||
398 | snd_l->ackers--; | |
a71eb720 JPM |
399 | rcv_l->bc_peer_is_up = true; |
400 | rcv_l->state = LINK_ESTABLISHED; | |
a91d55d1 | 401 | tipc_link_bc_ack_rcv(rcv_l, ack, 0, NULL, xmitq, NULL); |
26574db0 | 402 | trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!"); |
52666986 JPM |
403 | tipc_link_reset(rcv_l); |
404 | rcv_l->state = LINK_RESET; | |
405 | if (!snd_l->ackers) { | |
26574db0 | 406 | trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!"); |
52666986 | 407 | tipc_link_reset(snd_l); |
9a650838 | 408 | snd_l->state = LINK_RESET; |
52666986 JPM |
409 | __skb_queue_purge(xmitq); |
410 | } | |
2f566124 JPM |
411 | } |
412 | ||
413 | int tipc_link_bc_peers(struct tipc_link *l) | |
414 | { | |
415 | return l->ackers; | |
416 | } | |
417 | ||
e064cce1 | 418 | static u16 link_bc_rcv_gap(struct tipc_link *l) |
02d11ca2 JPM |
419 | { |
420 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
421 | u16 gap = 0; | |
422 | ||
423 | if (more(l->snd_nxt, l->rcv_nxt)) | |
424 | gap = l->snd_nxt - l->rcv_nxt; | |
425 | if (skb) | |
426 | gap = buf_seqno(skb) - l->rcv_nxt; | |
427 | return gap; | |
428 | } | |
429 | ||
959e1781 JPM |
430 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
431 | { | |
432 | l->mtu = mtu; | |
433 | } | |
434 | ||
435 | int tipc_link_mtu(struct tipc_link *l) | |
436 | { | |
437 | return l->mtu; | |
438 | } | |
439 | ||
fc1b6d6d TL |
440 | int tipc_link_mss(struct tipc_link *l) |
441 | { | |
442 | #ifdef CONFIG_TIPC_CRYPTO | |
443 | return l->mtu - INT_H_SIZE - EMSG_OVERHEAD; | |
444 | #else | |
445 | return l->mtu - INT_H_SIZE; | |
446 | #endif | |
447 | } | |
448 | ||
38206d59 JPM |
449 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
450 | { | |
451 | return l->rcv_nxt; | |
452 | } | |
453 | ||
454 | u16 tipc_link_acked(struct tipc_link *l) | |
455 | { | |
456 | return l->acked; | |
457 | } | |
458 | ||
459 | char *tipc_link_name(struct tipc_link *l) | |
460 | { | |
461 | return l->name; | |
462 | } | |
463 | ||
c140eb16 LDC |
464 | u32 tipc_link_state(struct tipc_link *l) |
465 | { | |
466 | return l->state; | |
467 | } | |
468 | ||
b97bf3fd | 469 | /** |
4323add6 | 470 | * tipc_link_create - create a new link |
d8141208 | 471 | * @net: pointer to associated network namespace |
0e05498e JPM |
472 | * @if_name: associated interface name |
473 | * @bearer_id: id (index) of associated bearer | |
474 | * @tolerance: link tolerance to be used by link | |
475 | * @net_plane: network plane (A,B,c..) this link belongs to | |
476 | * @mtu: mtu to be advertised by link | |
477 | * @priority: priority to be used by link | |
16ad3f40 JM |
478 | * @min_win: minimal send window to be used by link |
479 | * @max_win: maximal send window to be used by link | |
0e05498e | 480 | * @session: session to be used by link |
0e05498e | 481 | * @peer: node id of peer node |
fd556f20 | 482 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
483 | * @bc_sndlink: the namespace global link used for broadcast sending |
484 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
485 | * @inputq: queue to put messages ready for delivery |
486 | * @namedq: queue to put binding table update messages ready for delivery | |
487 | * @link: return value, pointer to put the created link | |
a99df449 RD |
488 | * @self: local unicast link id |
489 | * @peer_id: 128-bit ID of peer | |
c4307285 | 490 | * |
637b77fd | 491 | * Return: true if link was created, otherwise false |
b97bf3fd | 492 | */ |
c72fa872 | 493 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e | 494 | int tolerance, char net_plane, u32 mtu, int priority, |
16ad3f40 | 495 | u32 min_win, u32 max_win, u32 session, u32 self, |
25b0b9c4 | 496 | u32 peer, u8 *peer_id, u16 peer_caps, |
52666986 JPM |
497 | struct tipc_link *bc_sndlink, |
498 | struct tipc_link *bc_rcvlink, | |
499 | struct sk_buff_head *inputq, | |
500 | struct sk_buff_head *namedq, | |
440d8963 | 501 | struct tipc_link **link) |
b97bf3fd | 502 | { |
25b0b9c4 JM |
503 | char peer_str[NODE_ID_STR_LEN] = {0,}; |
504 | char self_str[NODE_ID_STR_LEN] = {0,}; | |
440d8963 | 505 | struct tipc_link *l; |
37b9c08a | 506 | |
440d8963 JPM |
507 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
508 | if (!l) | |
509 | return false; | |
510 | *link = l; | |
e74a386d | 511 | l->session = session; |
37b9c08a | 512 | |
25b0b9c4 JM |
513 | /* Set link name for unicast links only */ |
514 | if (peer_id) { | |
515 | tipc_nodeid2string(self_str, tipc_own_id(net)); | |
516 | if (strlen(self_str) > 16) | |
517 | sprintf(self_str, "%x", self); | |
518 | tipc_nodeid2string(peer_str, peer_id); | |
519 | if (strlen(peer_str) > 16) | |
520 | sprintf(peer_str, "%x", peer); | |
521 | } | |
522 | /* Peer i/f name will be completed by reset/activate message */ | |
7494cfa6 JM |
523 | snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown", |
524 | self_str, if_name, peer_str); | |
25b0b9c4 | 525 | |
e74a386d | 526 | strcpy(l->if_name, if_name); |
440d8963 | 527 | l->addr = peer; |
fd556f20 | 528 | l->peer_caps = peer_caps; |
c72fa872 | 529 | l->net = net; |
7ea817f4 | 530 | l->in_session = false; |
0e05498e JPM |
531 | l->bearer_id = bearer_id; |
532 | l->tolerance = tolerance; | |
047491ea JM |
533 | if (bc_rcvlink) |
534 | bc_rcvlink->tolerance = tolerance; | |
0e05498e JPM |
535 | l->net_plane = net_plane; |
536 | l->advertised_mtu = mtu; | |
537 | l->mtu = mtu; | |
538 | l->priority = priority; | |
16ad3f40 | 539 | tipc_link_set_queue_limits(l, min_win, max_win); |
c1ab3f1d | 540 | l->ackers = 1; |
52666986 JPM |
541 | l->bc_sndlink = bc_sndlink; |
542 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
543 | l->inputq = inputq; |
544 | l->namedq = namedq; | |
545 | l->state = LINK_RESETTING; | |
440d8963 JPM |
546 | __skb_queue_head_init(&l->transmq); |
547 | __skb_queue_head_init(&l->backlogq); | |
548 | __skb_queue_head_init(&l->deferdq); | |
58ee86b8 | 549 | __skb_queue_head_init(&l->failover_deferdq); |
440d8963 JPM |
550 | skb_queue_head_init(&l->wakeupq); |
551 | skb_queue_head_init(l->inputq); | |
552 | return true; | |
b97bf3fd PL |
553 | } |
554 | ||
32301906 JPM |
555 | /** |
556 | * tipc_link_bc_create - create new link to be used for broadcast | |
d8141208 | 557 | * @net: pointer to associated network namespace |
4c94cc2d | 558 | * @mtu: mtu to be used initially if no peers |
2e5117ba LW |
559 | * @min_win: minimal send window to be used by link |
560 | * @max_win: maximal send window to be used by link | |
32301906 JPM |
561 | * @inputq: queue to put messages ready for delivery |
562 | * @namedq: queue to put binding table update messages ready for delivery | |
563 | * @link: return value, pointer to put the created link | |
a99df449 RD |
564 | * @ownnode: identity of own node |
565 | * @peer: node id of peer node | |
566 | * @peer_id: 128-bit ID of peer | |
567 | * @peer_caps: bitmap describing peer node capabilities | |
568 | * @bc_sndlink: the namespace global link used for broadcast sending | |
32301906 | 569 | * |
637b77fd | 570 | * Return: true if link was created, otherwise false |
32301906 | 571 | */ |
03b6fefd | 572 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, u8 *peer_id, |
16ad3f40 | 573 | int mtu, u32 min_win, u32 max_win, u16 peer_caps, |
32301906 JPM |
574 | struct sk_buff_head *inputq, |
575 | struct sk_buff_head *namedq, | |
52666986 | 576 | struct tipc_link *bc_sndlink, |
32301906 JPM |
577 | struct tipc_link **link) |
578 | { | |
579 | struct tipc_link *l; | |
580 | ||
16ad3f40 JM |
581 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, min_win, |
582 | max_win, 0, ownnode, peer, NULL, peer_caps, | |
583 | bc_sndlink, NULL, inputq, namedq, link)) | |
32301906 JPM |
584 | return false; |
585 | ||
586 | l = *link; | |
03b6fefd TL |
587 | if (peer_id) { |
588 | char peer_str[NODE_ID_STR_LEN] = {0,}; | |
589 | ||
590 | tipc_nodeid2string(peer_str, peer_id); | |
591 | if (strlen(peer_str) > 16) | |
592 | sprintf(peer_str, "%x", peer); | |
593 | /* Broadcast receiver link name: "broadcast-link:<peer>" */ | |
594 | snprintf(l->name, sizeof(l->name), "%s:%s", tipc_bclink_name, | |
595 | peer_str); | |
596 | } else { | |
597 | strcpy(l->name, tipc_bclink_name); | |
598 | } | |
26574db0 | 599 | trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!"); |
32301906 | 600 | tipc_link_reset(l); |
52666986 | 601 | l->state = LINK_RESET; |
2f566124 | 602 | l->ackers = 0; |
52666986 | 603 | l->bc_rcvlink = l; |
32301906 | 604 | |
52666986 JPM |
605 | /* Broadcast send link is always up */ |
606 | if (link_is_bc_sndlink(l)) | |
607 | l->state = LINK_ESTABLISHED; | |
d999297c | 608 | |
01fd12bb JPM |
609 | /* Disable replicast if even a single peer doesn't support it */ |
610 | if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) | |
ba5f6a86 | 611 | tipc_bcast_toggle_rcast(net, false); |
01fd12bb | 612 | |
52666986 | 613 | return true; |
d999297c JPM |
614 | } |
615 | ||
6ab30f9c JPM |
616 | /** |
617 | * tipc_link_fsm_evt - link finite state machine | |
618 | * @l: pointer to link | |
619 | * @evt: state machine event to be processed | |
6ab30f9c | 620 | */ |
662921cd | 621 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 622 | { |
5045f7b9 | 623 | int rc = 0; |
26574db0 | 624 | int old_state = l->state; |
6ab30f9c JPM |
625 | |
626 | switch (l->state) { | |
662921cd | 627 | case LINK_RESETTING: |
6ab30f9c | 628 | switch (evt) { |
662921cd JPM |
629 | case LINK_PEER_RESET_EVT: |
630 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 631 | break; |
662921cd JPM |
632 | case LINK_RESET_EVT: |
633 | l->state = LINK_RESET; | |
634 | break; | |
635 | case LINK_FAILURE_EVT: | |
636 | case LINK_FAILOVER_BEGIN_EVT: | |
637 | case LINK_ESTABLISH_EVT: | |
638 | case LINK_FAILOVER_END_EVT: | |
639 | case LINK_SYNCH_BEGIN_EVT: | |
640 | case LINK_SYNCH_END_EVT: | |
641 | default: | |
642 | goto illegal_evt; | |
643 | } | |
644 | break; | |
645 | case LINK_RESET: | |
646 | switch (evt) { | |
647 | case LINK_PEER_RESET_EVT: | |
648 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 649 | break; |
662921cd JPM |
650 | case LINK_FAILOVER_BEGIN_EVT: |
651 | l->state = LINK_FAILINGOVER; | |
652 | case LINK_FAILURE_EVT: | |
653 | case LINK_RESET_EVT: | |
654 | case LINK_ESTABLISH_EVT: | |
655 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 656 | break; |
662921cd JPM |
657 | case LINK_SYNCH_BEGIN_EVT: |
658 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 659 | default: |
662921cd | 660 | goto illegal_evt; |
6ab30f9c JPM |
661 | } |
662 | break; | |
662921cd | 663 | case LINK_PEER_RESET: |
6ab30f9c | 664 | switch (evt) { |
662921cd JPM |
665 | case LINK_RESET_EVT: |
666 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 667 | break; |
662921cd JPM |
668 | case LINK_PEER_RESET_EVT: |
669 | case LINK_ESTABLISH_EVT: | |
670 | case LINK_FAILURE_EVT: | |
6ab30f9c | 671 | break; |
662921cd JPM |
672 | case LINK_SYNCH_BEGIN_EVT: |
673 | case LINK_SYNCH_END_EVT: | |
674 | case LINK_FAILOVER_BEGIN_EVT: | |
675 | case LINK_FAILOVER_END_EVT: | |
676 | default: | |
677 | goto illegal_evt; | |
678 | } | |
679 | break; | |
680 | case LINK_FAILINGOVER: | |
681 | switch (evt) { | |
682 | case LINK_FAILOVER_END_EVT: | |
683 | l->state = LINK_RESET; | |
6ab30f9c | 684 | break; |
662921cd JPM |
685 | case LINK_PEER_RESET_EVT: |
686 | case LINK_RESET_EVT: | |
687 | case LINK_ESTABLISH_EVT: | |
688 | case LINK_FAILURE_EVT: | |
689 | break; | |
690 | case LINK_FAILOVER_BEGIN_EVT: | |
691 | case LINK_SYNCH_BEGIN_EVT: | |
692 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 693 | default: |
662921cd | 694 | goto illegal_evt; |
6ab30f9c JPM |
695 | } |
696 | break; | |
662921cd | 697 | case LINK_ESTABLISHING: |
6ab30f9c | 698 | switch (evt) { |
662921cd JPM |
699 | case LINK_ESTABLISH_EVT: |
700 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 701 | break; |
662921cd JPM |
702 | case LINK_FAILOVER_BEGIN_EVT: |
703 | l->state = LINK_FAILINGOVER; | |
704 | break; | |
662921cd | 705 | case LINK_RESET_EVT: |
73f646ce JPM |
706 | l->state = LINK_RESET; |
707 | break; | |
662921cd | 708 | case LINK_FAILURE_EVT: |
73f646ce | 709 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
710 | case LINK_SYNCH_BEGIN_EVT: |
711 | case LINK_FAILOVER_END_EVT: | |
712 | break; | |
713 | case LINK_SYNCH_END_EVT: | |
714 | default: | |
715 | goto illegal_evt; | |
716 | } | |
717 | break; | |
718 | case LINK_ESTABLISHED: | |
719 | switch (evt) { | |
720 | case LINK_PEER_RESET_EVT: | |
721 | l->state = LINK_PEER_RESET; | |
722 | rc |= TIPC_LINK_DOWN_EVT; | |
723 | break; | |
724 | case LINK_FAILURE_EVT: | |
725 | l->state = LINK_RESETTING; | |
726 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 727 | break; |
662921cd JPM |
728 | case LINK_RESET_EVT: |
729 | l->state = LINK_RESET; | |
6ab30f9c | 730 | break; |
662921cd | 731 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 732 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 733 | break; |
662921cd JPM |
734 | case LINK_SYNCH_BEGIN_EVT: |
735 | l->state = LINK_SYNCHING; | |
736 | break; | |
662921cd JPM |
737 | case LINK_FAILOVER_BEGIN_EVT: |
738 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 739 | default: |
662921cd | 740 | goto illegal_evt; |
6ab30f9c JPM |
741 | } |
742 | break; | |
662921cd | 743 | case LINK_SYNCHING: |
6ab30f9c | 744 | switch (evt) { |
662921cd JPM |
745 | case LINK_PEER_RESET_EVT: |
746 | l->state = LINK_PEER_RESET; | |
747 | rc |= TIPC_LINK_DOWN_EVT; | |
748 | break; | |
749 | case LINK_FAILURE_EVT: | |
750 | l->state = LINK_RESETTING; | |
751 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 752 | break; |
662921cd JPM |
753 | case LINK_RESET_EVT: |
754 | l->state = LINK_RESET; | |
6ab30f9c | 755 | break; |
662921cd JPM |
756 | case LINK_ESTABLISH_EVT: |
757 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 758 | break; |
662921cd JPM |
759 | case LINK_SYNCH_END_EVT: |
760 | l->state = LINK_ESTABLISHED; | |
761 | break; | |
762 | case LINK_FAILOVER_BEGIN_EVT: | |
763 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 764 | default: |
662921cd | 765 | goto illegal_evt; |
6ab30f9c JPM |
766 | } |
767 | break; | |
768 | default: | |
662921cd | 769 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 770 | } |
26574db0 | 771 | trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
662921cd JPM |
772 | return rc; |
773 | illegal_evt: | |
774 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
775 | evt, l->state, l->name); | |
26574db0 | 776 | trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
6ab30f9c JPM |
777 | return rc; |
778 | } | |
779 | ||
333ef69e JPM |
780 | /* link_profile_stats - update statistical profiling of traffic |
781 | */ | |
782 | static void link_profile_stats(struct tipc_link *l) | |
783 | { | |
784 | struct sk_buff *skb; | |
785 | struct tipc_msg *msg; | |
786 | int length; | |
787 | ||
788 | /* Update counters used in statistical profiling of send traffic */ | |
789 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
790 | l->stats.queue_sz_counts++; | |
791 | ||
792 | skb = skb_peek(&l->transmq); | |
793 | if (!skb) | |
794 | return; | |
795 | msg = buf_msg(skb); | |
796 | length = msg_size(msg); | |
797 | ||
798 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
799 | if (msg_type(msg) != FIRST_FRAGMENT) | |
800 | return; | |
a7dc51ad | 801 | length = msg_size(msg_inner_hdr(msg)); |
333ef69e JPM |
802 | } |
803 | l->stats.msg_lengths_total += length; | |
804 | l->stats.msg_length_counts++; | |
805 | if (length <= 64) | |
806 | l->stats.msg_length_profile[0]++; | |
807 | else if (length <= 256) | |
808 | l->stats.msg_length_profile[1]++; | |
809 | else if (length <= 1024) | |
810 | l->stats.msg_length_profile[2]++; | |
811 | else if (length <= 4096) | |
812 | l->stats.msg_length_profile[3]++; | |
813 | else if (length <= 16384) | |
814 | l->stats.msg_length_profile[4]++; | |
815 | else if (length <= 32768) | |
816 | l->stats.msg_length_profile[5]++; | |
817 | else | |
818 | l->stats.msg_length_profile[6]++; | |
819 | } | |
820 | ||
26574db0 TL |
821 | /** |
822 | * tipc_link_too_silent - check if link is "too silent" | |
823 | * @l: tipc link to be checked | |
824 | * | |
637b77fd | 825 | * Return: true if the link 'silent_intv_cnt' is about to reach the |
26574db0 TL |
826 | * 'abort_limit' value, otherwise false |
827 | */ | |
828 | bool tipc_link_too_silent(struct tipc_link *l) | |
829 | { | |
830 | return (l->silent_intv_cnt + 2 > l->abort_limit); | |
831 | } | |
832 | ||
333ef69e JPM |
833 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
834 | */ | |
835 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
836 | { | |
c91522f8 YX |
837 | int mtyp = 0; |
838 | int rc = 0; | |
42b18f60 JPM |
839 | bool state = false; |
840 | bool probe = false; | |
841 | bool setup = false; | |
52666986 JPM |
842 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
843 | u16 bc_acked = l->bc_rcvlink->acked; | |
35c55c98 | 844 | struct tipc_mon_state *mstate = &l->mon_state; |
5045f7b9 | 845 | |
26574db0 TL |
846 | trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " "); |
847 | trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " "); | |
662921cd JPM |
848 | switch (l->state) { |
849 | case LINK_ESTABLISHED: | |
850 | case LINK_SYNCHING: | |
42b18f60 | 851 | mtyp = STATE_MSG; |
35c55c98 JPM |
852 | link_profile_stats(l); |
853 | tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); | |
854 | if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) | |
855 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
42b18f60 | 856 | state = bc_acked != bc_snt; |
35c55c98 JPM |
857 | state |= l->bc_rcvlink->rcv_unacked; |
858 | state |= l->rcv_unacked; | |
859 | state |= !skb_queue_empty(&l->transmq); | |
35c55c98 JPM |
860 | probe = mstate->probing; |
861 | probe |= l->silent_intv_cnt; | |
862 | if (probe || mstate->monitoring) | |
863 | l->silent_intv_cnt++; | |
6ef9dcb7 | 864 | probe |= !skb_queue_empty(&l->deferdq); |
16ad3f40 JM |
865 | if (l->snd_nxt == l->checkpoint) { |
866 | tipc_link_update_cwin(l, 0, 0); | |
867 | probe = true; | |
868 | } | |
869 | l->checkpoint = l->snd_nxt; | |
662921cd JPM |
870 | break; |
871 | case LINK_RESET: | |
42b18f60 JPM |
872 | setup = l->rst_cnt++ <= 4; |
873 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 874 | mtyp = RESET_MSG; |
662921cd JPM |
875 | break; |
876 | case LINK_ESTABLISHING: | |
42b18f60 | 877 | setup = true; |
5045f7b9 | 878 | mtyp = ACTIVATE_MSG; |
662921cd | 879 | break; |
662921cd | 880 | case LINK_PEER_RESET: |
598411d7 | 881 | case LINK_RESETTING: |
662921cd JPM |
882 | case LINK_FAILINGOVER: |
883 | break; | |
884 | default: | |
885 | break; | |
5045f7b9 | 886 | } |
662921cd | 887 | |
42b18f60 | 888 | if (state || probe || setup) |
8d6e79d3 | 889 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); |
5045f7b9 | 890 | |
333ef69e JPM |
891 | return rc; |
892 | } | |
893 | ||
b97bf3fd | 894 | /** |
3127a020 | 895 | * link_schedule_user - schedule a message sender for wakeup after congestion |
365ad353 JPM |
896 | * @l: congested link |
897 | * @hdr: header of message that is being sent | |
50100a5e | 898 | * Create pseudo msg to send back to user when congestion abates |
b97bf3fd | 899 | */ |
365ad353 | 900 | static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) |
b97bf3fd | 901 | { |
365ad353 JPM |
902 | u32 dnode = tipc_own_addr(l->net); |
903 | u32 dport = msg_origport(hdr); | |
3127a020 JPM |
904 | struct sk_buff *skb; |
905 | ||
3127a020 JPM |
906 | /* Create and schedule wakeup pseudo message */ |
907 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
365ad353 | 908 | dnode, l->addr, dport, 0, 0); |
3127a020 | 909 | if (!skb) |
22d85c79 | 910 | return -ENOBUFS; |
365ad353 JPM |
911 | msg_set_dest_droppable(buf_msg(skb), true); |
912 | TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); | |
913 | skb_queue_tail(&l->wakeupq, skb); | |
914 | l->stats.link_congs++; | |
26574db0 | 915 | trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!"); |
3127a020 | 916 | return -ELINKCONG; |
b97bf3fd PL |
917 | } |
918 | ||
50100a5e JPM |
919 | /** |
920 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
365ad353 JPM |
921 | * @l: congested link |
922 | * Wake up a number of waiting users, as permitted by available space | |
923 | * in the send queue | |
50100a5e | 924 | */ |
e064cce1 | 925 | static void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 926 | { |
7c5b4205 JM |
927 | struct sk_buff_head *wakeupq = &l->wakeupq; |
928 | struct sk_buff_head *inputq = l->inputq; | |
58d78b32 | 929 | struct sk_buff *skb, *tmp; |
7c5b4205 JM |
930 | struct sk_buff_head tmpq; |
931 | int avail[5] = {0,}; | |
932 | int imp = 0; | |
50100a5e | 933 | |
7c5b4205 JM |
934 | __skb_queue_head_init(&tmpq); |
935 | ||
936 | for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) | |
937 | avail[imp] = l->backlog[imp].limit - l->backlog[imp].len; | |
938 | ||
939 | skb_queue_walk_safe(wakeupq, skb, tmp) { | |
1f66d161 | 940 | imp = TIPC_SKB_CB(skb)->chain_imp; |
7c5b4205 JM |
941 | if (avail[imp] <= 0) |
942 | continue; | |
943 | avail[imp]--; | |
944 | __skb_unlink(skb, wakeupq); | |
945 | __skb_queue_tail(&tmpq, skb); | |
b97bf3fd | 946 | } |
7c5b4205 JM |
947 | |
948 | spin_lock_bh(&inputq->lock); | |
949 | skb_queue_splice_tail(&tmpq, inputq); | |
950 | spin_unlock_bh(&inputq->lock); | |
951 | ||
b97bf3fd PL |
952 | } |
953 | ||
a34f8291 HM |
954 | /** |
955 | * tipc_link_set_skb_retransmit_time - set the time at which retransmission of | |
956 | * the given skb should be next attempted | |
957 | * @skb: skb to set a future retransmission time for | |
958 | * @l: link the skb will be transmitted on | |
959 | */ | |
960 | static void tipc_link_set_skb_retransmit_time(struct sk_buff *skb, | |
961 | struct tipc_link *l) | |
962 | { | |
963 | if (link_is_bc_sndlink(l)) | |
964 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; | |
965 | else | |
966 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME; | |
967 | } | |
968 | ||
6e498158 | 969 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 970 | { |
a1f8dd34 | 971 | struct sk_buff_head list; |
e95584a8 | 972 | u32 imp; |
a1f8dd34 YX |
973 | |
974 | __skb_queue_head_init(&list); | |
975 | ||
7ea817f4 | 976 | l->in_session = false; |
f7a93780 TL |
977 | /* Force re-synch of peer session number before establishing */ |
978 | l->peer_session--; | |
e74a386d | 979 | l->session++; |
6e498158 | 980 | l->mtu = l->advertised_mtu; |
a1f8dd34 | 981 | |
3f32d0be | 982 | spin_lock_bh(&l->wakeupq.lock); |
a1f8dd34 YX |
983 | skb_queue_splice_init(&l->wakeupq, &list); |
984 | spin_unlock_bh(&l->wakeupq.lock); | |
985 | ||
3f32d0be | 986 | spin_lock_bh(&l->inputq->lock); |
a1f8dd34 | 987 | skb_queue_splice_init(&list, l->inputq); |
3f32d0be | 988 | spin_unlock_bh(&l->inputq->lock); |
3f32d0be | 989 | |
6e498158 JPM |
990 | __skb_queue_purge(&l->transmq); |
991 | __skb_queue_purge(&l->deferdq); | |
2af5ae37 | 992 | __skb_queue_purge(&l->backlogq); |
58ee86b8 | 993 | __skb_queue_purge(&l->failover_deferdq); |
e95584a8 TL |
994 | for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) { |
995 | l->backlog[imp].len = 0; | |
996 | l->backlog[imp].target_bskb = NULL; | |
997 | } | |
6e498158 | 998 | kfree_skb(l->reasm_buf); |
2320bcda | 999 | kfree_skb(l->reasm_tnlmsg); |
6e498158 JPM |
1000 | kfree_skb(l->failover_reasm_skb); |
1001 | l->reasm_buf = NULL; | |
2320bcda | 1002 | l->reasm_tnlmsg = NULL; |
6e498158 JPM |
1003 | l->failover_reasm_skb = NULL; |
1004 | l->rcv_unacked = 0; | |
1005 | l->snd_nxt = 1; | |
1006 | l->rcv_nxt = 1; | |
9012de50 JM |
1007 | l->snd_nxt_state = 1; |
1008 | l->rcv_nxt_state = 1; | |
c1ab3f1d | 1009 | l->acked = 0; |
d7626b5a TL |
1010 | l->last_gap = 0; |
1011 | kfree(l->last_ga); | |
1012 | l->last_ga = NULL; | |
6e498158 | 1013 | l->silent_intv_cnt = 0; |
88e8ac70 | 1014 | l->rst_cnt = 0; |
52666986 | 1015 | l->bc_peer_is_up = false; |
35c55c98 | 1016 | memset(&l->mon_state, 0, sizeof(l->mon_state)); |
38206d59 | 1017 | tipc_link_reset_stats(l); |
b97bf3fd PL |
1018 | } |
1019 | ||
af9b028e JPM |
1020 | /** |
1021 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
d8141208 | 1022 | * @l: link to use |
af9b028e JPM |
1023 | * @list: chain of buffers containing message |
1024 | * @xmitq: returned list of packets to be sent by caller | |
1025 | * | |
365ad353 | 1026 | * Consumes the buffer chain. |
af9b028e | 1027 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted |
637b77fd | 1028 | * Return: 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
af9b028e JPM |
1029 | */ |
1030 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
1031 | struct sk_buff_head *xmitq) | |
1032 | { | |
06e7c70c TL |
1033 | struct sk_buff_head *backlogq = &l->backlogq; |
1034 | struct sk_buff_head *transmq = &l->transmq; | |
1035 | struct sk_buff *skb, *_skb; | |
1036 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; | |
af9b028e JPM |
1037 | u16 ack = l->rcv_nxt - 1; |
1038 | u16 seqno = l->snd_nxt; | |
95901122 | 1039 | int pkt_cnt = skb_queue_len(list); |
fc1b6d6d | 1040 | unsigned int mss = tipc_link_mss(l); |
16ad3f40 | 1041 | unsigned int cwin = l->window; |
06e7c70c | 1042 | unsigned int mtu = l->mtu; |
b7741344 | 1043 | struct tipc_msg *hdr; |
06e7c70c | 1044 | bool new_bundle; |
365ad353 | 1045 | int rc = 0; |
b7741344 | 1046 | int imp; |
af9b028e | 1047 | |
b7741344 HL |
1048 | if (pkt_cnt <= 0) |
1049 | return 0; | |
1050 | ||
1051 | hdr = buf_msg(skb_peek(list)); | |
4952cd3e | 1052 | if (unlikely(msg_size(hdr) > mtu)) { |
2320bcda TL |
1053 | pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n", |
1054 | skb_queue_len(list), msg_user(hdr), | |
1055 | msg_type(hdr), msg_size(hdr), mtu); | |
e654f9f5 | 1056 | __skb_queue_purge(list); |
af9b028e | 1057 | return -EMSGSIZE; |
4952cd3e | 1058 | } |
af9b028e | 1059 | |
b7741344 | 1060 | imp = msg_importance(hdr); |
365ad353 JPM |
1061 | /* Allow oversubscription of one data msg per source at congestion */ |
1062 | if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { | |
1063 | if (imp == TIPC_SYSTEM_IMPORTANCE) { | |
1064 | pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); | |
1065 | return -ENOBUFS; | |
1066 | } | |
1067 | rc = link_schedule_user(l, hdr); | |
1068 | } | |
1069 | ||
95901122 JPM |
1070 | if (pkt_cnt > 1) { |
1071 | l->stats.sent_fragmented++; | |
1072 | l->stats.sent_fragments += pkt_cnt; | |
1073 | } | |
1074 | ||
af9b028e | 1075 | /* Prepare each packet for sending, and add to relevant queue: */ |
06e7c70c | 1076 | while ((skb = __skb_dequeue(list))) { |
16ad3f40 | 1077 | if (likely(skb_queue_len(transmq) < cwin)) { |
06e7c70c TL |
1078 | hdr = buf_msg(skb); |
1079 | msg_set_seqno(hdr, seqno); | |
1080 | msg_set_ack(hdr, ack); | |
1081 | msg_set_bcast_ack(hdr, bc_ack); | |
af9b028e | 1082 | _skb = skb_clone(skb, GFP_ATOMIC); |
4952cd3e | 1083 | if (!_skb) { |
06e7c70c | 1084 | kfree_skb(skb); |
e654f9f5 | 1085 | __skb_queue_purge(list); |
af9b028e | 1086 | return -ENOBUFS; |
4952cd3e | 1087 | } |
af9b028e | 1088 | __skb_queue_tail(transmq, skb); |
a34f8291 | 1089 | tipc_link_set_skb_retransmit_time(skb, l); |
af9b028e | 1090 | __skb_queue_tail(xmitq, _skb); |
c1ab3f1d | 1091 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e | 1092 | l->rcv_unacked = 0; |
95901122 | 1093 | l->stats.sent_pkts++; |
af9b028e JPM |
1094 | seqno++; |
1095 | continue; | |
1096 | } | |
06e7c70c | 1097 | if (tipc_msg_try_bundle(l->backlog[imp].target_bskb, &skb, |
fc1b6d6d | 1098 | mss, l->addr, &new_bundle)) { |
06e7c70c TL |
1099 | if (skb) { |
1100 | /* Keep a ref. to the skb for next try */ | |
1101 | l->backlog[imp].target_bskb = skb; | |
1102 | l->backlog[imp].len++; | |
1103 | __skb_queue_tail(backlogq, skb); | |
1104 | } else { | |
1105 | if (new_bundle) { | |
1106 | l->stats.sent_bundles++; | |
1107 | l->stats.sent_bundled++; | |
1108 | } | |
1109 | l->stats.sent_bundled++; | |
1110 | } | |
af9b028e JPM |
1111 | continue; |
1112 | } | |
e95584a8 | 1113 | l->backlog[imp].target_bskb = NULL; |
06e7c70c TL |
1114 | l->backlog[imp].len += (1 + skb_queue_len(list)); |
1115 | __skb_queue_tail(backlogq, skb); | |
af9b028e JPM |
1116 | skb_queue_splice_tail_init(list, backlogq); |
1117 | } | |
1118 | l->snd_nxt = seqno; | |
365ad353 | 1119 | return rc; |
af9b028e JPM |
1120 | } |
1121 | ||
16ad3f40 JM |
1122 | static void tipc_link_update_cwin(struct tipc_link *l, int released, |
1123 | bool retransmitted) | |
1124 | { | |
1125 | int bklog_len = skb_queue_len(&l->backlogq); | |
1126 | struct sk_buff_head *txq = &l->transmq; | |
1127 | int txq_len = skb_queue_len(txq); | |
1128 | u16 cwin = l->window; | |
1129 | ||
1130 | /* Enter fast recovery */ | |
1131 | if (unlikely(retransmitted)) { | |
1132 | l->ssthresh = max_t(u16, l->window / 2, 300); | |
edadedf1 | 1133 | l->window = min_t(u16, l->ssthresh, l->window); |
16ad3f40 JM |
1134 | return; |
1135 | } | |
1136 | /* Enter slow start */ | |
1137 | if (unlikely(!released)) { | |
1138 | l->ssthresh = max_t(u16, l->window / 2, 300); | |
1139 | l->window = l->min_win; | |
1140 | return; | |
1141 | } | |
1142 | /* Don't increase window if no pressure on the transmit queue */ | |
1143 | if (txq_len + bklog_len < cwin) | |
1144 | return; | |
1145 | ||
1146 | /* Don't increase window if there are holes the transmit queue */ | |
1147 | if (txq_len && l->snd_nxt - buf_seqno(skb_peek(txq)) != txq_len) | |
1148 | return; | |
1149 | ||
1150 | l->cong_acks += released; | |
1151 | ||
1152 | /* Slow start */ | |
1153 | if (cwin <= l->ssthresh) { | |
1154 | l->window = min_t(u16, cwin + released, l->max_win); | |
1155 | return; | |
1156 | } | |
1157 | /* Congestion avoidance */ | |
1158 | if (l->cong_acks < cwin) | |
1159 | return; | |
1160 | l->window = min_t(u16, ++cwin, l->max_win); | |
1161 | l->cong_acks = 0; | |
1162 | } | |
1163 | ||
e064cce1 Y |
1164 | static void tipc_link_advance_backlog(struct tipc_link *l, |
1165 | struct sk_buff_head *xmitq) | |
d999297c | 1166 | { |
16ad3f40 JM |
1167 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
1168 | struct sk_buff_head *txq = &l->transmq; | |
d999297c | 1169 | struct sk_buff *skb, *_skb; |
d999297c | 1170 | u16 ack = l->rcv_nxt - 1; |
16ad3f40 JM |
1171 | u16 seqno = l->snd_nxt; |
1172 | struct tipc_msg *hdr; | |
1173 | u16 cwin = l->window; | |
e95584a8 | 1174 | u32 imp; |
d999297c | 1175 | |
16ad3f40 | 1176 | while (skb_queue_len(txq) < cwin) { |
d999297c JPM |
1177 | skb = skb_peek(&l->backlogq); |
1178 | if (!skb) | |
1179 | break; | |
1180 | _skb = skb_clone(skb, GFP_ATOMIC); | |
1181 | if (!_skb) | |
1182 | break; | |
1183 | __skb_dequeue(&l->backlogq); | |
1184 | hdr = buf_msg(skb); | |
e95584a8 TL |
1185 | imp = msg_importance(hdr); |
1186 | l->backlog[imp].len--; | |
1187 | if (unlikely(skb == l->backlog[imp].target_bskb)) | |
1188 | l->backlog[imp].target_bskb = NULL; | |
d999297c | 1189 | __skb_queue_tail(&l->transmq, skb); |
a34f8291 | 1190 | tipc_link_set_skb_retransmit_time(skb, l); |
05572271 | 1191 | |
d999297c | 1192 | __skb_queue_tail(xmitq, _skb); |
c1ab3f1d | 1193 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 1194 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
1195 | msg_set_ack(hdr, ack); |
1196 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c | 1197 | l->rcv_unacked = 0; |
95901122 | 1198 | l->stats.sent_pkts++; |
d999297c JPM |
1199 | seqno++; |
1200 | } | |
1201 | l->snd_nxt = seqno; | |
1202 | } | |
1203 | ||
6a6b5c8b TL |
1204 | /** |
1205 | * link_retransmit_failure() - Detect repeated retransmit failures | |
1206 | * @l: tipc link sender | |
1207 | * @r: tipc link receiver (= l in case of unicast) | |
6a6b5c8b TL |
1208 | * @rc: returned code |
1209 | * | |
1210 | * Return: true if the repeated retransmit failures happens, otherwise | |
1211 | * false | |
1212 | */ | |
1213 | static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r, | |
71204231 | 1214 | int *rc) |
d356eeba | 1215 | { |
6a6b5c8b TL |
1216 | struct sk_buff *skb = skb_peek(&l->transmq); |
1217 | struct tipc_msg *hdr; | |
1218 | ||
1219 | if (!skb) | |
1220 | return false; | |
6a6b5c8b | 1221 | |
71204231 TL |
1222 | if (!TIPC_SKB_CB(skb)->retr_cnt) |
1223 | return false; | |
6a6b5c8b | 1224 | |
71204231 | 1225 | if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp + |
426071f1 | 1226 | msecs_to_jiffies(r->tolerance * 10))) |
71204231 TL |
1227 | return false; |
1228 | ||
1229 | hdr = buf_msg(skb); | |
1230 | if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr))) | |
1231 | return false; | |
6a6b5c8b | 1232 | |
71204231 TL |
1233 | pr_warn("Retransmission failure on link <%s>\n", l->name); |
1234 | link_print(l, "State of link "); | |
1235 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
1236 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
1237 | pr_info("sqno %u, prev: %x, dest: %x\n", | |
1238 | msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr)); | |
1239 | pr_info("retr_stamp %d, retr_cnt %d\n", | |
1240 | jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp), | |
1241 | TIPC_SKB_CB(skb)->retr_cnt); | |
1242 | ||
1243 | trace_tipc_list_dump(&l->transmq, true, "retrans failure!"); | |
1244 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!"); | |
1245 | trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!"); | |
1246 | ||
1247 | if (link_is_bc_sndlink(l)) { | |
1248 | r->state = LINK_RESET; | |
d7626b5a | 1249 | *rc |= TIPC_LINK_DOWN_EVT; |
71204231 | 1250 | } else { |
d7626b5a | 1251 | *rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
6a6b5c8b | 1252 | } |
52666986 | 1253 | |
71204231 | 1254 | return true; |
d356eeba AS |
1255 | } |
1256 | ||
c637c103 | 1257 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1258 | * |
c637c103 | 1259 | * Consumes buffer if message is of right type |
7ae934be EH |
1260 | * Node lock must be held |
1261 | */ | |
52666986 | 1262 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1263 | struct sk_buff_head *inputq) |
7ae934be | 1264 | { |
399574d4 | 1265 | struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; |
a853e4c6 JPM |
1266 | struct tipc_msg *hdr = buf_msg(skb); |
1267 | ||
1268 | switch (msg_user(hdr)) { | |
c637c103 JPM |
1269 | case TIPC_LOW_IMPORTANCE: |
1270 | case TIPC_MEDIUM_IMPORTANCE: | |
1271 | case TIPC_HIGH_IMPORTANCE: | |
1272 | case TIPC_CRITICAL_IMPORTANCE: | |
2f487712 | 1273 | if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { |
399574d4 | 1274 | skb_queue_tail(mc_inputq, skb); |
a853e4c6 JPM |
1275 | return true; |
1276 | } | |
7f8901b7 | 1277 | fallthrough; |
2f487712 | 1278 | case CONN_MANAGER: |
36c0a9df | 1279 | skb_queue_tail(inputq, skb); |
c637c103 | 1280 | return true; |
399574d4 JM |
1281 | case GROUP_PROTOCOL: |
1282 | skb_queue_tail(mc_inputq, skb); | |
1283 | return true; | |
7ae934be | 1284 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1285 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1286 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1287 | return true; |
1288 | case MSG_BUNDLER: | |
dff29b1a | 1289 | case TUNNEL_PROTOCOL: |
c637c103 | 1290 | case MSG_FRAGMENTER: |
7ae934be | 1291 | case BCAST_PROTOCOL: |
c637c103 | 1292 | return false; |
1ef6f7c9 TL |
1293 | #ifdef CONFIG_TIPC_CRYPTO |
1294 | case MSG_CRYPTO: | |
1295 | tipc_crypto_msg_rcv(l->net, skb); | |
1296 | return true; | |
1297 | #endif | |
7ae934be | 1298 | default: |
c637c103 JPM |
1299 | pr_warn("Dropping received illegal msg type\n"); |
1300 | kfree_skb(skb); | |
7384b538 | 1301 | return true; |
f2219c32 | 1302 | } |
7ae934be | 1303 | } |
c637c103 JPM |
1304 | |
1305 | /* tipc_link_input - process packet that has passed link protocol check | |
1306 | * | |
1307 | * Consumes buffer | |
7ae934be | 1308 | */ |
9073fb8b | 1309 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
58ee86b8 TL |
1310 | struct sk_buff_head *inputq, |
1311 | struct sk_buff **reasm_skb) | |
7ae934be | 1312 | { |
6e498158 | 1313 | struct tipc_msg *hdr = buf_msg(skb); |
c637c103 | 1314 | struct sk_buff *iskb; |
9945e804 | 1315 | struct sk_buff_head tmpq; |
6e498158 | 1316 | int usr = msg_user(hdr); |
6e498158 | 1317 | int pos = 0; |
c637c103 | 1318 | |
6e498158 | 1319 | if (usr == MSG_BUNDLER) { |
9945e804 | 1320 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1321 | l->stats.recv_bundles++; |
1322 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1323 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1324 | tipc_data_input(l, iskb, &tmpq); |
1325 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1326 | return 0; |
6e498158 JPM |
1327 | } else if (usr == MSG_FRAGMENTER) { |
1328 | l->stats.recv_fragments++; | |
1329 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1330 | l->stats.recv_fragmented++; | |
9073fb8b | 1331 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1332 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1333 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1334 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1335 | } |
662921cd | 1336 | return 0; |
6e498158 | 1337 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1338 | tipc_bcast_lock(l->net); |
52666986 | 1339 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1340 | tipc_bcast_unlock(l->net); |
6e498158 | 1341 | } |
58ee86b8 | 1342 | |
6e498158 | 1343 | kfree_skb(skb); |
662921cd | 1344 | return 0; |
7ae934be EH |
1345 | } |
1346 | ||
58ee86b8 TL |
1347 | /* tipc_link_tnl_rcv() - receive TUNNEL_PROTOCOL message, drop or process the |
1348 | * inner message along with the ones in the old link's | |
1349 | * deferdq | |
1350 | * @l: tunnel link | |
1351 | * @skb: TUNNEL_PROTOCOL message | |
1352 | * @inputq: queue to put messages ready for delivery | |
1353 | */ | |
1354 | static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1355 | struct sk_buff_head *inputq) | |
1356 | { | |
1357 | struct sk_buff **reasm_skb = &l->failover_reasm_skb; | |
2320bcda | 1358 | struct sk_buff **reasm_tnlmsg = &l->reasm_tnlmsg; |
58ee86b8 TL |
1359 | struct sk_buff_head *fdefq = &l->failover_deferdq; |
1360 | struct tipc_msg *hdr = buf_msg(skb); | |
1361 | struct sk_buff *iskb; | |
1362 | int ipos = 0; | |
1363 | int rc = 0; | |
1364 | u16 seqno; | |
1365 | ||
2320bcda TL |
1366 | if (msg_type(hdr) == SYNCH_MSG) { |
1367 | kfree_skb(skb); | |
1368 | return 0; | |
1369 | } | |
58ee86b8 | 1370 | |
2320bcda TL |
1371 | /* Not a fragment? */ |
1372 | if (likely(!msg_nof_fragms(hdr))) { | |
1373 | if (unlikely(!tipc_msg_extract(skb, &iskb, &ipos))) { | |
1374 | pr_warn_ratelimited("Unable to extract msg, defq: %d\n", | |
1375 | skb_queue_len(fdefq)); | |
1376 | return 0; | |
1377 | } | |
1378 | kfree_skb(skb); | |
1379 | } else { | |
1380 | /* Set fragment type for buf_append */ | |
1381 | if (msg_fragm_no(hdr) == 1) | |
1382 | msg_set_type(hdr, FIRST_FRAGMENT); | |
1383 | else if (msg_fragm_no(hdr) < msg_nof_fragms(hdr)) | |
1384 | msg_set_type(hdr, FRAGMENT); | |
1385 | else | |
1386 | msg_set_type(hdr, LAST_FRAGMENT); | |
1387 | ||
1388 | if (!tipc_buf_append(reasm_tnlmsg, &skb)) { | |
1389 | /* Successful but non-complete reassembly? */ | |
1390 | if (*reasm_tnlmsg || link_is_bc_rcvlink(l)) | |
1391 | return 0; | |
1392 | pr_warn_ratelimited("Unable to reassemble tunnel msg\n"); | |
1393 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1394 | } | |
1395 | iskb = skb; | |
58ee86b8 TL |
1396 | } |
1397 | ||
1398 | do { | |
1399 | seqno = buf_seqno(iskb); | |
58ee86b8 TL |
1400 | if (unlikely(less(seqno, l->drop_point))) { |
1401 | kfree_skb(iskb); | |
1402 | continue; | |
1403 | } | |
58ee86b8 TL |
1404 | if (unlikely(seqno != l->drop_point)) { |
1405 | __tipc_skb_queue_sorted(fdefq, seqno, iskb); | |
1406 | continue; | |
1407 | } | |
1408 | ||
1409 | l->drop_point++; | |
58ee86b8 TL |
1410 | if (!tipc_data_input(l, iskb, inputq)) |
1411 | rc |= tipc_link_input(l, iskb, inputq, reasm_skb); | |
1412 | if (unlikely(rc)) | |
1413 | break; | |
1414 | } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point))); | |
1415 | ||
58ee86b8 TL |
1416 | return rc; |
1417 | } | |
1418 | ||
d7626b5a TL |
1419 | /** |
1420 | * tipc_get_gap_ack_blks - get Gap ACK blocks from PROTOCOL/STATE_MSG | |
1421 | * @ga: returned pointer to the Gap ACK blocks if any | |
1422 | * @l: the tipc link | |
1423 | * @hdr: the PROTOCOL/STATE_MSG header | |
1424 | * @uc: desired Gap ACK blocks type, i.e. unicast (= 1) or broadcast (= 0) | |
1425 | * | |
1426 | * Return: the total Gap ACK blocks size | |
1427 | */ | |
1428 | u16 tipc_get_gap_ack_blks(struct tipc_gap_ack_blks **ga, struct tipc_link *l, | |
1429 | struct tipc_msg *hdr, bool uc) | |
1430 | { | |
1431 | struct tipc_gap_ack_blks *p; | |
1432 | u16 sz = 0; | |
1433 | ||
1434 | /* Does peer support the Gap ACK blocks feature? */ | |
1435 | if (l->peer_caps & TIPC_GAP_ACK_BLOCK) { | |
1436 | p = (struct tipc_gap_ack_blks *)msg_data(hdr); | |
1437 | sz = ntohs(p->len); | |
1438 | /* Sanity check */ | |
e034c6d2 | 1439 | if (sz == struct_size(p, gacks, p->ugack_cnt + p->bgack_cnt)) { |
d7626b5a TL |
1440 | /* Good, check if the desired type exists */ |
1441 | if ((uc && p->ugack_cnt) || (!uc && p->bgack_cnt)) | |
1442 | goto ok; | |
1443 | /* Backward compatible: peer might not support bc, but uc? */ | |
e034c6d2 | 1444 | } else if (uc && sz == struct_size(p, gacks, p->ugack_cnt)) { |
d7626b5a TL |
1445 | if (p->ugack_cnt) { |
1446 | p->bgack_cnt = 0; | |
1447 | goto ok; | |
1448 | } | |
1449 | } | |
d999297c | 1450 | } |
d7626b5a TL |
1451 | /* Other cases: ignore! */ |
1452 | p = NULL; | |
1453 | ||
1454 | ok: | |
1455 | *ga = p; | |
1456 | return sz; | |
d999297c JPM |
1457 | } |
1458 | ||
d7626b5a TL |
1459 | static u8 __tipc_build_gap_ack_blks(struct tipc_gap_ack_blks *ga, |
1460 | struct tipc_link *l, u8 start_index) | |
9195948f | 1461 | { |
d7626b5a | 1462 | struct tipc_gap_ack *gacks = &ga->gacks[start_index]; |
9195948f | 1463 | struct sk_buff *skb = skb_peek(&l->deferdq); |
d7626b5a | 1464 | u16 expect, seqno = 0; |
9195948f TL |
1465 | u8 n = 0; |
1466 | ||
d7626b5a TL |
1467 | if (!skb) |
1468 | return 0; | |
9195948f TL |
1469 | |
1470 | expect = buf_seqno(skb); | |
1471 | skb_queue_walk(&l->deferdq, skb) { | |
1472 | seqno = buf_seqno(skb); | |
1473 | if (unlikely(more(seqno, expect))) { | |
d7626b5a TL |
1474 | gacks[n].ack = htons(expect - 1); |
1475 | gacks[n].gap = htons(seqno - expect); | |
1476 | if (++n >= MAX_GAP_ACK_BLKS / 2) { | |
d7626b5a | 1477 | pr_info_ratelimited("Gacks on %s: %d, ql: %d!\n", |
03b6fefd | 1478 | l->name, n, |
d7626b5a TL |
1479 | skb_queue_len(&l->deferdq)); |
1480 | return n; | |
9195948f TL |
1481 | } |
1482 | } else if (unlikely(less(seqno, expect))) { | |
1483 | pr_warn("Unexpected skb in deferdq!\n"); | |
1484 | continue; | |
1485 | } | |
1486 | expect = seqno + 1; | |
1487 | } | |
1488 | ||
1489 | /* last block */ | |
d7626b5a TL |
1490 | gacks[n].ack = htons(seqno); |
1491 | gacks[n].gap = 0; | |
9195948f | 1492 | n++; |
d7626b5a TL |
1493 | return n; |
1494 | } | |
9195948f | 1495 | |
d7626b5a TL |
1496 | /* tipc_build_gap_ack_blks - build Gap ACK blocks |
1497 | * @l: tipc unicast link | |
1498 | * @hdr: the tipc message buffer to store the Gap ACK blocks after built | |
1499 | * | |
1500 | * The function builds Gap ACK blocks for both the unicast & broadcast receiver | |
1501 | * links of a certain peer, the buffer after built has the network data format | |
1502 | * as found at the struct tipc_gap_ack_blks definition. | |
1503 | * | |
1504 | * returns the actual allocated memory size | |
1505 | */ | |
1506 | static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr) | |
1507 | { | |
1508 | struct tipc_link *bcl = l->bc_rcvlink; | |
1509 | struct tipc_gap_ack_blks *ga; | |
1510 | u16 len; | |
1511 | ||
1512 | ga = (struct tipc_gap_ack_blks *)msg_data(hdr); | |
1513 | ||
1514 | /* Start with broadcast link first */ | |
1515 | tipc_bcast_lock(bcl->net); | |
1516 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); | |
1517 | msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); | |
1518 | ga->bgack_cnt = __tipc_build_gap_ack_blks(ga, bcl, 0); | |
1519 | tipc_bcast_unlock(bcl->net); | |
1520 | ||
1521 | /* Now for unicast link, but an explicit NACK only (???) */ | |
1522 | ga->ugack_cnt = (msg_seq_gap(hdr)) ? | |
1523 | __tipc_build_gap_ack_blks(ga, l, ga->bgack_cnt) : 0; | |
1524 | ||
1525 | /* Total len */ | |
e034c6d2 | 1526 | len = struct_size(ga, gacks, ga->bgack_cnt + ga->ugack_cnt); |
9195948f | 1527 | ga->len = htons(len); |
9195948f TL |
1528 | return len; |
1529 | } | |
1530 | ||
1531 | /* tipc_link_advance_transmq - advance TIPC link transmq queue by releasing | |
1532 | * acked packets, also doing retransmissions if | |
1533 | * gaps found | |
1534 | * @l: tipc link with transmq queue to be advanced | |
d7626b5a | 1535 | * @r: tipc link "receiver" i.e. in case of broadcast (= "l" if unicast) |
9195948f TL |
1536 | * @acked: seqno of last packet acked by peer without any gaps before |
1537 | * @gap: # of gap packets | |
1538 | * @ga: buffer pointer to Gap ACK blocks from peer | |
1539 | * @xmitq: queue for accumulating the retransmitted packets if any | |
d7626b5a TL |
1540 | * @retransmitted: returned boolean value if a retransmission is really issued |
1541 | * @rc: returned code e.g. TIPC_LINK_DOWN_EVT if a repeated retransmit failures | |
1542 | * happens (- unlikely case) | |
6a6b5c8b | 1543 | * |
d7626b5a | 1544 | * Return: the number of packets released from the link transmq |
9195948f | 1545 | */ |
d7626b5a TL |
1546 | static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r, |
1547 | u16 acked, u16 gap, | |
6a6b5c8b | 1548 | struct tipc_gap_ack_blks *ga, |
d7626b5a TL |
1549 | struct sk_buff_head *xmitq, |
1550 | bool *retransmitted, int *rc) | |
9195948f | 1551 | { |
d7626b5a TL |
1552 | struct tipc_gap_ack_blks *last_ga = r->last_ga, *this_ga = NULL; |
1553 | struct tipc_gap_ack *gacks = NULL; | |
9195948f TL |
1554 | struct sk_buff *skb, *_skb, *tmp; |
1555 | struct tipc_msg *hdr; | |
d7626b5a TL |
1556 | u32 qlen = skb_queue_len(&l->transmq); |
1557 | u16 nacked = acked, ngap = gap, gack_cnt = 0; | |
9195948f TL |
1558 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
1559 | u16 ack = l->rcv_nxt - 1; | |
6a6b5c8b | 1560 | u16 seqno, n = 0; |
d7626b5a TL |
1561 | u16 end = r->acked, start = end, offset = r->last_gap; |
1562 | u16 si = (last_ga) ? last_ga->start_index : 0; | |
1563 | bool is_uc = !link_is_bc_sndlink(l); | |
1564 | bool bc_has_acked = false; | |
1565 | ||
c6ed7a5c TL |
1566 | trace_tipc_link_retrans(r, acked + 1, acked + gap, &l->transmq); |
1567 | ||
d7626b5a TL |
1568 | /* Determine Gap ACK blocks if any for the particular link */ |
1569 | if (ga && is_uc) { | |
1570 | /* Get the Gap ACKs, uc part */ | |
1571 | gack_cnt = ga->ugack_cnt; | |
1572 | gacks = &ga->gacks[ga->bgack_cnt]; | |
1573 | } else if (ga) { | |
1574 | /* Copy the Gap ACKs, bc part, for later renewal if needed */ | |
e034c6d2 | 1575 | this_ga = kmemdup(ga, struct_size(ga, gacks, ga->bgack_cnt), |
d7626b5a TL |
1576 | GFP_ATOMIC); |
1577 | if (likely(this_ga)) { | |
1578 | this_ga->start_index = 0; | |
1579 | /* Start with the bc Gap ACKs */ | |
1580 | gack_cnt = this_ga->bgack_cnt; | |
1581 | gacks = &this_ga->gacks[0]; | |
1582 | } else { | |
1583 | /* Hmm, we can get in trouble..., simply ignore it */ | |
1584 | pr_warn_ratelimited("Ignoring bc Gap ACKs, no memory\n"); | |
1585 | } | |
1586 | } | |
6a6b5c8b | 1587 | |
d7626b5a | 1588 | /* Advance the link transmq */ |
9195948f TL |
1589 | skb_queue_walk_safe(&l->transmq, skb, tmp) { |
1590 | seqno = buf_seqno(skb); | |
1591 | ||
1592 | next_gap_ack: | |
d7626b5a TL |
1593 | if (less_eq(seqno, nacked)) { |
1594 | if (is_uc) | |
1595 | goto release; | |
1596 | /* Skip packets peer has already acked */ | |
1597 | if (!more(seqno, r->acked)) | |
1598 | continue; | |
1599 | /* Get the next of last Gap ACK blocks */ | |
1600 | while (more(seqno, end)) { | |
1601 | if (!last_ga || si >= last_ga->bgack_cnt) | |
1602 | break; | |
1603 | start = end + offset + 1; | |
1604 | end = ntohs(last_ga->gacks[si].ack); | |
1605 | offset = ntohs(last_ga->gacks[si].gap); | |
1606 | si++; | |
1607 | WARN_ONCE(more(start, end) || | |
1608 | (!offset && | |
1609 | si < last_ga->bgack_cnt) || | |
1610 | si > MAX_GAP_ACK_BLKS, | |
1611 | "Corrupted Gap ACK: %d %d %d %d %d\n", | |
1612 | start, end, offset, si, | |
1613 | last_ga->bgack_cnt); | |
1614 | } | |
1615 | /* Check against the last Gap ACK block */ | |
1616 | if (in_range(seqno, start, end)) | |
1617 | continue; | |
1618 | /* Update/release the packet peer is acking */ | |
1619 | bc_has_acked = true; | |
1620 | if (--TIPC_SKB_CB(skb)->ackers) | |
1621 | continue; | |
1622 | release: | |
9195948f TL |
1623 | /* release skb */ |
1624 | __skb_unlink(skb, &l->transmq); | |
1625 | kfree_skb(skb); | |
d7626b5a TL |
1626 | } else if (less_eq(seqno, nacked + ngap)) { |
1627 | /* First gap: check if repeated retrans failures? */ | |
1628 | if (unlikely(seqno == acked + 1 && | |
1629 | link_retransmit_failure(l, r, rc))) { | |
1630 | /* Ignore this bc Gap ACKs if any */ | |
1631 | kfree(this_ga); | |
1632 | this_ga = NULL; | |
1633 | break; | |
1634 | } | |
71204231 | 1635 | /* retransmit skb if unrestricted*/ |
382f598f TL |
1636 | if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) |
1637 | continue; | |
a34f8291 | 1638 | tipc_link_set_skb_retransmit_time(skb, l); |
fc1b6d6d | 1639 | _skb = pskb_copy(skb, GFP_ATOMIC); |
9195948f TL |
1640 | if (!_skb) |
1641 | continue; | |
1642 | hdr = buf_msg(_skb); | |
1643 | msg_set_ack(hdr, ack); | |
1644 | msg_set_bcast_ack(hdr, bc_ack); | |
1645 | _skb->priority = TC_PRIO_CONTROL; | |
1646 | __skb_queue_tail(xmitq, _skb); | |
1647 | l->stats.retransmitted++; | |
03b6fefd TL |
1648 | if (!is_uc) |
1649 | r->stats.retransmitted++; | |
d7626b5a | 1650 | *retransmitted = true; |
71204231 TL |
1651 | /* Increase actual retrans counter & mark first time */ |
1652 | if (!TIPC_SKB_CB(skb)->retr_cnt++) | |
1653 | TIPC_SKB_CB(skb)->retr_stamp = jiffies; | |
9195948f TL |
1654 | } else { |
1655 | /* retry with Gap ACK blocks if any */ | |
d7626b5a | 1656 | if (n >= gack_cnt) |
9195948f | 1657 | break; |
d7626b5a TL |
1658 | nacked = ntohs(gacks[n].ack); |
1659 | ngap = ntohs(gacks[n].gap); | |
9195948f TL |
1660 | n++; |
1661 | goto next_gap_ack; | |
1662 | } | |
1663 | } | |
d7626b5a TL |
1664 | |
1665 | /* Renew last Gap ACK blocks for bc if needed */ | |
1666 | if (bc_has_acked) { | |
1667 | if (this_ga) { | |
1668 | kfree(last_ga); | |
1669 | r->last_ga = this_ga; | |
1670 | r->last_gap = gap; | |
1671 | } else if (last_ga) { | |
1672 | if (less(acked, start)) { | |
1673 | si--; | |
1674 | offset = start - acked - 1; | |
1675 | } else if (less(acked, end)) { | |
1676 | acked = end; | |
1677 | } | |
1678 | if (si < last_ga->bgack_cnt) { | |
1679 | last_ga->start_index = si; | |
1680 | r->last_gap = offset; | |
1681 | } else { | |
1682 | kfree(last_ga); | |
1683 | r->last_ga = NULL; | |
1684 | r->last_gap = 0; | |
1685 | } | |
1686 | } else { | |
1687 | r->last_gap = 0; | |
1688 | } | |
1689 | r->acked = acked; | |
1690 | } else { | |
1691 | kfree(this_ga); | |
1692 | } | |
1693 | ||
1694 | return qlen - skb_queue_len(&l->transmq); | |
9195948f TL |
1695 | } |
1696 | ||
34b9cd64 | 1697 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1698 | * |
1699 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1700 | * risk of ack storms towards the sender | |
f9aa358a | 1701 | */ |
34b9cd64 | 1702 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1703 | { |
52666986 JPM |
1704 | if (!l) |
1705 | return 0; | |
1706 | ||
1707 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1708 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1709 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1710 | return 0; |
1711 | l->rcv_unacked = 0; | |
02d11ca2 JPM |
1712 | |
1713 | /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ | |
1714 | l->snd_nxt = l->rcv_nxt; | |
1715 | return TIPC_LINK_SND_STATE; | |
52666986 | 1716 | } |
52666986 | 1717 | /* Unicast ACK */ |
f9aa358a JPM |
1718 | l->rcv_unacked = 0; |
1719 | l->stats.sent_acks++; | |
8d6e79d3 | 1720 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
52666986 | 1721 | return 0; |
f9aa358a JPM |
1722 | } |
1723 | ||
282b3a05 JPM |
1724 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1725 | */ | |
1726 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1727 | { | |
1728 | int mtyp = RESET_MSG; | |
634696b1 | 1729 | struct sk_buff *skb; |
282b3a05 JPM |
1730 | |
1731 | if (l->state == LINK_ESTABLISHING) | |
1732 | mtyp = ACTIVATE_MSG; | |
1733 | ||
8d6e79d3 | 1734 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); |
634696b1 JPM |
1735 | |
1736 | /* Inform peer that this endpoint is going down if applicable */ | |
1737 | skb = skb_peek_tail(xmitq); | |
1738 | if (skb && (l->state == LINK_RESET)) | |
1739 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1740 | } |
1741 | ||
f9aa358a | 1742 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
e0a05ebe JPM |
1743 | * Note that sending of broadcast NACK is coordinated among nodes, to |
1744 | * reduce the risk of NACK storms towards the sender | |
f9aa358a | 1745 | */ |
e0a05ebe JPM |
1746 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
1747 | struct sk_buff_head *xmitq) | |
f9aa358a JPM |
1748 | { |
1749 | u32 def_cnt = ++l->stats.deferred_recv; | |
02288248 JM |
1750 | struct sk_buff_head *dfq = &l->deferdq; |
1751 | u32 defq_len = skb_queue_len(dfq); | |
e0a05ebe | 1752 | int match1, match2; |
f9aa358a | 1753 | |
e0a05ebe JPM |
1754 | if (link_is_bc_rcvlink(l)) { |
1755 | match1 = def_cnt & 0xf; | |
1756 | match2 = tipc_own_addr(l->net) & 0xf; | |
1757 | if (match1 == match2) | |
1758 | return TIPC_LINK_SND_STATE; | |
1759 | return 0; | |
1760 | } | |
52666986 | 1761 | |
02288248 JM |
1762 | if (defq_len >= 3 && !((defq_len - 3) % 16)) { |
1763 | u16 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1764 | ||
1765 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, | |
1766 | rcvgap, 0, 0, xmitq); | |
1767 | } | |
e0a05ebe | 1768 | return 0; |
f9aa358a JPM |
1769 | } |
1770 | ||
d999297c | 1771 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1772 | * @l: the link that should handle the message |
d999297c JPM |
1773 | * @skb: TIPC packet |
1774 | * @xmitq: queue to place packets to be sent after this call | |
1775 | */ | |
1776 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1777 | struct sk_buff_head *xmitq) | |
1778 | { | |
f9aa358a | 1779 | struct sk_buff_head *defq = &l->deferdq; |
382f598f | 1780 | struct tipc_msg *hdr = buf_msg(skb); |
81204c49 | 1781 | u16 seqno, rcv_nxt, win_lim; |
16ad3f40 | 1782 | int released = 0; |
d999297c JPM |
1783 | int rc = 0; |
1784 | ||
382f598f TL |
1785 | /* Verify and update link state */ |
1786 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) | |
1787 | return tipc_link_proto_rcv(l, skb, xmitq); | |
1788 | ||
1789 | /* Don't send probe at next timeout expiration */ | |
1790 | l->silent_intv_cnt = 0; | |
1791 | ||
f9aa358a | 1792 | do { |
d999297c | 1793 | hdr = buf_msg(skb); |
f9aa358a JPM |
1794 | seqno = msg_seqno(hdr); |
1795 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1796 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c | 1797 | |
662921cd | 1798 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1799 | if (l->state == LINK_ESTABLISHING) |
1800 | rc = TIPC_LINK_UP_EVT; | |
16ad3f40 JM |
1801 | kfree_skb(skb); |
1802 | break; | |
d999297c JPM |
1803 | } |
1804 | ||
81204c49 JPM |
1805 | /* Drop if outside receive window */ |
1806 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1807 | l->stats.duplicates++; | |
16ad3f40 JM |
1808 | kfree_skb(skb); |
1809 | break; | |
d999297c | 1810 | } |
d7626b5a TL |
1811 | released += tipc_link_advance_transmq(l, l, msg_ack(hdr), 0, |
1812 | NULL, NULL, NULL, NULL); | |
d999297c | 1813 | |
81204c49 JPM |
1814 | /* Defer delivery if sequence gap */ |
1815 | if (unlikely(seqno != rcv_nxt)) { | |
03b6fefd TL |
1816 | if (!__tipc_skb_queue_sorted(defq, seqno, skb)) |
1817 | l->stats.duplicates++; | |
e0a05ebe | 1818 | rc |= tipc_link_build_nack_msg(l, xmitq); |
f9aa358a | 1819 | break; |
d999297c JPM |
1820 | } |
1821 | ||
81204c49 | 1822 | /* Deliver packet */ |
d999297c | 1823 | l->rcv_nxt++; |
95901122 | 1824 | l->stats.recv_pkts++; |
58ee86b8 TL |
1825 | |
1826 | if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL)) | |
1827 | rc |= tipc_link_tnl_rcv(l, skb, l->inputq); | |
1828 | else if (!tipc_data_input(l, skb, l->inputq)) | |
1829 | rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf); | |
f9aa358a | 1830 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1831 | rc |= tipc_link_build_state_msg(l, xmitq); |
02d11ca2 | 1832 | if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
52666986 | 1833 | break; |
382f598f | 1834 | } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt))); |
f9aa358a | 1835 | |
16ad3f40 JM |
1836 | /* Forward queues and wake up waiting users */ |
1837 | if (released) { | |
1838 | tipc_link_update_cwin(l, released, 0); | |
1839 | tipc_link_advance_backlog(l, xmitq); | |
1840 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1841 | link_prepare_wakeup(l); | |
1842 | } | |
d999297c JPM |
1843 | return rc; |
1844 | } | |
1845 | ||
426cc2b8 | 1846 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
1847 | bool probe_reply, u16 rcvgap, |
1848 | int tolerance, int priority, | |
426cc2b8 JPM |
1849 | struct sk_buff_head *xmitq) |
1850 | { | |
03b6fefd TL |
1851 | struct tipc_mon_state *mstate = &l->mon_state; |
1852 | struct sk_buff_head *dfq = &l->deferdq; | |
02d11ca2 | 1853 | struct tipc_link *bcl = l->bc_rcvlink; |
e74a386d | 1854 | struct tipc_msg *hdr; |
03b6fefd | 1855 | struct sk_buff *skb; |
02d11ca2 | 1856 | bool node_up = link_is_up(bcl); |
03b6fefd | 1857 | u16 glen = 0, bc_rcvgap = 0; |
35c55c98 JPM |
1858 | int dlen = 0; |
1859 | void *data; | |
426cc2b8 JPM |
1860 | |
1861 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1862 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1863 | return; |
1864 | ||
e74a386d JPM |
1865 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1866 | return; | |
1867 | ||
02288248 | 1868 | if ((probe || probe_reply) && !skb_queue_empty(dfq)) |
e74a386d JPM |
1869 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; |
1870 | ||
1871 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
9195948f TL |
1872 | tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ, |
1873 | l->addr, tipc_own_addr(l->net), 0, 0, 0); | |
e74a386d JPM |
1874 | if (!skb) |
1875 | return; | |
1876 | ||
1877 | hdr = buf_msg(skb); | |
35c55c98 | 1878 | data = msg_data(hdr); |
e74a386d JPM |
1879 | msg_set_session(hdr, l->session); |
1880 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1881 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1882 | msg_set_next_sent(hdr, l->snd_nxt); |
1883 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
02d11ca2 | 1884 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
06bd2b1e | 1885 | msg_set_bc_ack_invalid(hdr, !node_up); |
52666986 | 1886 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
426cc2b8 JPM |
1887 | msg_set_link_tolerance(hdr, tolerance); |
1888 | msg_set_linkprio(hdr, priority); | |
1889 | msg_set_redundant_link(hdr, node_up); | |
1890 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1891 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1892 | |
1893 | if (mtyp == STATE_MSG) { | |
9012de50 JM |
1894 | if (l->peer_caps & TIPC_LINK_PROTO_SEQNO) |
1895 | msg_set_seqno(hdr, l->snd_nxt_state++); | |
e74a386d | 1896 | msg_set_seq_gap(hdr, rcvgap); |
03b6fefd TL |
1897 | bc_rcvgap = link_bc_rcv_gap(bcl); |
1898 | msg_set_bc_gap(hdr, bc_rcvgap); | |
426cc2b8 | 1899 | msg_set_probe(hdr, probe); |
8d6e79d3 | 1900 | msg_set_is_keepalive(hdr, probe || probe_reply); |
9195948f | 1901 | if (l->peer_caps & TIPC_GAP_ACK_BLOCK) |
d7626b5a | 1902 | glen = tipc_build_gap_ack_blks(l, hdr); |
9195948f TL |
1903 | tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id); |
1904 | msg_set_size(hdr, INT_H_SIZE + glen + dlen); | |
1905 | skb_trim(skb, INT_H_SIZE + glen + dlen); | |
426cc2b8 | 1906 | l->stats.sent_states++; |
52666986 | 1907 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1908 | } else { |
1909 | /* RESET_MSG or ACTIVATE_MSG */ | |
91986ee1 TL |
1910 | if (mtyp == ACTIVATE_MSG) { |
1911 | msg_set_dest_session_valid(hdr, 1); | |
1912 | msg_set_dest_session(hdr, l->peer_session); | |
1913 | } | |
426cc2b8 | 1914 | msg_set_max_pkt(hdr, l->advertised_mtu); |
35c55c98 JPM |
1915 | strcpy(data, l->if_name); |
1916 | msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
1917 | skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
426cc2b8 | 1918 | } |
e74a386d JPM |
1919 | if (probe) |
1920 | l->stats.sent_probes++; | |
1921 | if (rcvgap) | |
1922 | l->stats.sent_nacks++; | |
03b6fefd TL |
1923 | if (bc_rcvgap) |
1924 | bcl->stats.sent_nacks++; | |
426cc2b8 | 1925 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1926 | __skb_queue_tail(xmitq, skb); |
26574db0 | 1927 | trace_tipc_proto_build(skb, false, l->name); |
b97bf3fd PL |
1928 | } |
1929 | ||
c140eb16 LDC |
1930 | void tipc_link_create_dummy_tnl_msg(struct tipc_link *l, |
1931 | struct sk_buff_head *xmitq) | |
1932 | { | |
1933 | u32 onode = tipc_own_addr(l->net); | |
1934 | struct tipc_msg *hdr, *ihdr; | |
1935 | struct sk_buff_head tnlq; | |
1936 | struct sk_buff *skb; | |
1937 | u32 dnode = l->addr; | |
1938 | ||
e654f9f5 | 1939 | __skb_queue_head_init(&tnlq); |
c140eb16 LDC |
1940 | skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG, |
1941 | INT_H_SIZE, BASIC_H_SIZE, | |
1942 | dnode, onode, 0, 0, 0); | |
1943 | if (!skb) { | |
1944 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
1945 | return; | |
1946 | } | |
1947 | ||
1948 | hdr = buf_msg(skb); | |
1949 | msg_set_msgcnt(hdr, 1); | |
1950 | msg_set_bearer_id(hdr, l->peer_bearer_id); | |
1951 | ||
1952 | ihdr = (struct tipc_msg *)msg_data(hdr); | |
1953 | tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1954 | BASIC_H_SIZE, dnode); | |
1955 | msg_set_errcode(ihdr, TIPC_ERR_NO_PORT); | |
1956 | __skb_queue_tail(&tnlq, skb); | |
1957 | tipc_link_xmit(l, &tnlq, xmitq); | |
1958 | } | |
1959 | ||
6e498158 | 1960 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1961 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1962 | */ |
6e498158 JPM |
1963 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1964 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1965 | { |
58ee86b8 | 1966 | struct sk_buff_head *fdefq = &tnl->failover_deferdq; |
6e498158 JPM |
1967 | struct sk_buff *skb, *tnlskb; |
1968 | struct tipc_msg *hdr, tnlhdr; | |
1969 | struct sk_buff_head *queue = &l->transmq; | |
2320bcda | 1970 | struct sk_buff_head tmpxq, tnlq, frags; |
6e498158 | 1971 | u16 pktlen, pktcnt, seqno = l->snd_nxt; |
2320bcda | 1972 | bool pktcnt_need_update = false; |
4929a932 | 1973 | u16 syncpt; |
2320bcda | 1974 | int rc; |
b97bf3fd | 1975 | |
6e498158 | 1976 | if (!tnl) |
b97bf3fd PL |
1977 | return; |
1978 | ||
e654f9f5 | 1979 | __skb_queue_head_init(&tnlq); |
4929a932 TL |
1980 | /* Link Synching: |
1981 | * From now on, send only one single ("dummy") SYNCH message | |
1982 | * to peer. The SYNCH message does not contain any data, just | |
1983 | * a header conveying the synch point to the peer. | |
1984 | */ | |
1985 | if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { | |
1986 | tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG, | |
1987 | INT_H_SIZE, 0, l->addr, | |
1988 | tipc_own_addr(l->net), | |
1989 | 0, 0, 0); | |
1990 | if (!tnlskb) { | |
1991 | pr_warn("%sunable to create dummy SYNCH_MSG\n", | |
1992 | link_co_err); | |
1993 | return; | |
1994 | } | |
1995 | ||
1996 | hdr = buf_msg(tnlskb); | |
1997 | syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1; | |
1998 | msg_set_syncpt(hdr, syncpt); | |
1999 | msg_set_bearer_id(hdr, l->peer_bearer_id); | |
2000 | __skb_queue_tail(&tnlq, tnlskb); | |
2001 | tipc_link_xmit(tnl, &tnlq, xmitq); | |
2002 | return; | |
2003 | } | |
2004 | ||
d0d605c5 TL |
2005 | __skb_queue_head_init(&tmpxq); |
2006 | __skb_queue_head_init(&frags); | |
2007 | /* At least one packet required for safe algorithm => add dummy */ | |
2008 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
2009 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), | |
2010 | 0, 0, TIPC_ERR_NO_PORT); | |
2011 | if (!skb) { | |
2012 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
2013 | return; | |
2014 | } | |
2015 | __skb_queue_tail(&tnlq, skb); | |
2016 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
2017 | __skb_queue_purge(&tmpxq); | |
2018 | ||
6e498158 | 2019 | /* Initialize reusable tunnel packet header */ |
e74a386d | 2020 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 | 2021 | mtyp, INT_H_SIZE, l->addr); |
58ee86b8 TL |
2022 | if (mtyp == SYNCH_MSG) |
2023 | pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq)); | |
2024 | else | |
2025 | pktcnt = skb_queue_len(&l->transmq); | |
2026 | pktcnt += skb_queue_len(&l->backlogq); | |
6e498158 JPM |
2027 | msg_set_msgcnt(&tnlhdr, pktcnt); |
2028 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
2029 | tnl: | |
2030 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 2031 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
2032 | hdr = buf_msg(skb); |
2033 | if (queue == &l->backlogq) | |
2034 | msg_set_seqno(hdr, seqno++); | |
2035 | pktlen = msg_size(hdr); | |
2320bcda TL |
2036 | |
2037 | /* Tunnel link MTU is not large enough? This could be | |
2038 | * due to: | |
2039 | * 1) Link MTU has just changed or set differently; | |
2040 | * 2) Or FAILOVER on the top of a SYNCH message | |
2041 | * | |
2042 | * The 2nd case should not happen if peer supports | |
2043 | * TIPC_TUNNEL_ENHANCED | |
2044 | */ | |
2045 | if (pktlen > tnl->mtu - INT_H_SIZE) { | |
2046 | if (mtyp == FAILOVER_MSG && | |
2047 | (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { | |
2048 | rc = tipc_msg_fragment(skb, &tnlhdr, tnl->mtu, | |
2049 | &frags); | |
2050 | if (rc) { | |
2051 | pr_warn("%sunable to frag msg: rc %d\n", | |
2052 | link_co_err, rc); | |
2053 | return; | |
2054 | } | |
2055 | pktcnt += skb_queue_len(&frags) - 1; | |
2056 | pktcnt_need_update = true; | |
2057 | skb_queue_splice_tail_init(&frags, &tnlq); | |
2058 | continue; | |
2059 | } | |
2060 | /* Unluckily, peer doesn't have TIPC_TUNNEL_ENHANCED | |
2061 | * => Just warn it and return! | |
2062 | */ | |
2063 | pr_warn_ratelimited("%stoo large msg <%d, %d>: %d!\n", | |
2064 | link_co_err, msg_user(hdr), | |
2065 | msg_type(hdr), msg_size(hdr)); | |
2066 | return; | |
2067 | } | |
2068 | ||
6e498158 | 2069 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); |
57d5f64d | 2070 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC); |
6e498158 JPM |
2071 | if (!tnlskb) { |
2072 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
2073 | return; |
2074 | } | |
6e498158 JPM |
2075 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
2076 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
2077 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 2078 | } |
6e498158 JPM |
2079 | if (queue != &l->backlogq) { |
2080 | queue = &l->backlogq; | |
2081 | goto tnl; | |
f006c9c7 | 2082 | } |
1dab3d5a | 2083 | |
2320bcda TL |
2084 | if (pktcnt_need_update) |
2085 | skb_queue_walk(&tnlq, skb) { | |
2086 | hdr = buf_msg(skb); | |
2087 | msg_set_msgcnt(hdr, pktcnt); | |
2088 | } | |
2089 | ||
6e498158 | 2090 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 2091 | |
6e498158 JPM |
2092 | if (mtyp == FAILOVER_MSG) { |
2093 | tnl->drop_point = l->rcv_nxt; | |
2094 | tnl->failover_reasm_skb = l->reasm_buf; | |
2095 | l->reasm_buf = NULL; | |
58ee86b8 TL |
2096 | |
2097 | /* Failover the link's deferdq */ | |
2098 | if (unlikely(!skb_queue_empty(fdefq))) { | |
2099 | pr_warn("Link failover deferdq not empty: %d!\n", | |
2100 | skb_queue_len(fdefq)); | |
2101 | __skb_queue_purge(fdefq); | |
2102 | } | |
2103 | skb_queue_splice_init(&l->deferdq, fdefq); | |
2da71425 | 2104 | } |
b97bf3fd PL |
2105 | } |
2106 | ||
c0b14a08 TL |
2107 | /** |
2108 | * tipc_link_failover_prepare() - prepare tnl for link failover | |
2109 | * | |
2110 | * This is a special version of the precursor - tipc_link_tnl_prepare(), | |
2111 | * see the tipc_node_link_failover() for details | |
2112 | * | |
2113 | * @l: failover link | |
2114 | * @tnl: tunnel link | |
2115 | * @xmitq: queue for messages to be xmited | |
2116 | */ | |
2117 | void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl, | |
2118 | struct sk_buff_head *xmitq) | |
2119 | { | |
2120 | struct sk_buff_head *fdefq = &tnl->failover_deferdq; | |
2121 | ||
2122 | tipc_link_create_dummy_tnl_msg(tnl, xmitq); | |
2123 | ||
8ebed8ae | 2124 | /* This failover link endpoint was never established before, |
c0b14a08 TL |
2125 | * so it has not received anything from peer. |
2126 | * Otherwise, it must be a normal failover situation or the | |
2127 | * node has entered SELF_DOWN_PEER_LEAVING and both peer nodes | |
2128 | * would have to start over from scratch instead. | |
2129 | */ | |
c0b14a08 TL |
2130 | tnl->drop_point = 1; |
2131 | tnl->failover_reasm_skb = NULL; | |
2132 | ||
2133 | /* Initiate the link's failover deferdq */ | |
2134 | if (unlikely(!skb_queue_empty(fdefq))) { | |
2135 | pr_warn("Link failover deferdq not empty: %d!\n", | |
2136 | skb_queue_len(fdefq)); | |
2137 | __skb_queue_purge(fdefq); | |
2138 | } | |
2139 | } | |
2140 | ||
7ea817f4 JM |
2141 | /* tipc_link_validate_msg(): validate message against current link state |
2142 | * Returns true if message should be accepted, otherwise false | |
2143 | */ | |
2144 | bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr) | |
2145 | { | |
2146 | u16 curr_session = l->peer_session; | |
2147 | u16 session = msg_session(hdr); | |
2148 | int mtyp = msg_type(hdr); | |
2149 | ||
2150 | if (msg_user(hdr) != LINK_PROTOCOL) | |
2151 | return true; | |
2152 | ||
2153 | switch (mtyp) { | |
2154 | case RESET_MSG: | |
2155 | if (!l->in_session) | |
2156 | return true; | |
2157 | /* Accept only RESET with new session number */ | |
2158 | return more(session, curr_session); | |
2159 | case ACTIVATE_MSG: | |
2160 | if (!l->in_session) | |
2161 | return true; | |
2162 | /* Accept only ACTIVATE with new or current session number */ | |
2163 | return !less(session, curr_session); | |
2164 | case STATE_MSG: | |
2165 | /* Accept only STATE with current session number */ | |
2166 | if (!l->in_session) | |
2167 | return false; | |
2168 | if (session != curr_session) | |
2169 | return false; | |
d949cfed LDC |
2170 | /* Extra sanity check */ |
2171 | if (!link_is_up(l) && msg_ack(hdr)) | |
2172 | return false; | |
7ea817f4 JM |
2173 | if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO)) |
2174 | return true; | |
2175 | /* Accept only STATE with new sequence number */ | |
2176 | return !less(msg_seqno(hdr), l->rcv_nxt_state); | |
2177 | default: | |
2178 | return false; | |
2179 | } | |
2180 | } | |
2181 | ||
d999297c JPM |
2182 | /* tipc_link_proto_rcv(): receive link level protocol message : |
2183 | * Note that network plane id propagates through the network, and may | |
2184 | * change at any time. The node with lowest numerical id determines | |
2185 | * network plane | |
2186 | */ | |
2187 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
2188 | struct sk_buff_head *xmitq) | |
2189 | { | |
2190 | struct tipc_msg *hdr = buf_msg(skb); | |
9195948f | 2191 | struct tipc_gap_ack_blks *ga = NULL; |
d7626b5a TL |
2192 | bool reply = msg_probe(hdr), retransmitted = false; |
2193 | u16 dlen = msg_data_sz(hdr), glen = 0; | |
d999297c JPM |
2194 | u16 peers_snd_nxt = msg_next_sent(hdr); |
2195 | u16 peers_tol = msg_link_tolerance(hdr); | |
2196 | u16 peers_prio = msg_linkprio(hdr); | |
d7626b5a TL |
2197 | u16 gap = msg_seq_gap(hdr); |
2198 | u16 ack = msg_ack(hdr); | |
2be80c2d | 2199 | u16 rcv_nxt = l->rcv_nxt; |
d7626b5a | 2200 | u16 rcvgap = 0; |
73f646ce | 2201 | int mtyp = msg_type(hdr); |
d7626b5a | 2202 | int rc = 0, released; |
d999297c | 2203 | char *if_name; |
d7626b5a | 2204 | void *data; |
d999297c | 2205 | |
26574db0 | 2206 | trace_tipc_proto_rcv(skb, false, l->name); |
52666986 | 2207 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
2208 | goto exit; |
2209 | ||
e74a386d | 2210 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
2211 | l->net_plane = msg_net_plane(hdr); |
2212 | ||
35c55c98 JPM |
2213 | skb_linearize(skb); |
2214 | hdr = buf_msg(skb); | |
2215 | data = msg_data(hdr); | |
2216 | ||
26574db0 TL |
2217 | if (!tipc_link_validate_msg(l, hdr)) { |
2218 | trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!"); | |
2219 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!"); | |
7ea817f4 | 2220 | goto exit; |
26574db0 | 2221 | } |
7ea817f4 | 2222 | |
73f646ce | 2223 | switch (mtyp) { |
d999297c | 2224 | case RESET_MSG: |
d999297c | 2225 | case ACTIVATE_MSG: |
d999297c JPM |
2226 | /* Complete own link name with peer's interface name */ |
2227 | if_name = strrchr(l->name, ':') + 1; | |
2228 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
2229 | break; | |
2230 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
2231 | break; | |
35c55c98 | 2232 | strncpy(if_name, data, TIPC_MAX_IF_NAME); |
d999297c JPM |
2233 | |
2234 | /* Update own tolerance if peer indicates a non-zero value */ | |
047491ea | 2235 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { |
d999297c | 2236 | l->tolerance = peers_tol; |
047491ea JM |
2237 | l->bc_rcvlink->tolerance = peers_tol; |
2238 | } | |
d999297c JPM |
2239 | /* Update own priority if peer's priority is higher */ |
2240 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
2241 | l->priority = peers_prio; | |
2242 | ||
7ab412d3 JM |
2243 | /* If peer is going down we want full re-establish cycle */ |
2244 | if (msg_peer_stopping(hdr)) { | |
634696b1 | 2245 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
7ab412d3 JM |
2246 | break; |
2247 | } | |
91986ee1 TL |
2248 | |
2249 | /* If this endpoint was re-created while peer was ESTABLISHING | |
2250 | * it doesn't know current session number. Force re-synch. | |
2251 | */ | |
2252 | if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) && | |
2253 | l->session != msg_dest_session(hdr)) { | |
2254 | if (less(l->session, msg_dest_session(hdr))) | |
2255 | l->session = msg_dest_session(hdr) + 1; | |
2256 | break; | |
2257 | } | |
2258 | ||
7ab412d3 JM |
2259 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
2260 | if (mtyp == RESET_MSG || !link_is_up(l)) | |
73f646ce JPM |
2261 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
2262 | ||
2263 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
7ab412d3 | 2264 | if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING) |
73f646ce JPM |
2265 | rc = TIPC_LINK_UP_EVT; |
2266 | ||
d999297c | 2267 | l->peer_session = msg_session(hdr); |
7ea817f4 | 2268 | l->in_session = true; |
d999297c | 2269 | l->peer_bearer_id = msg_bearer_id(hdr); |
d999297c JPM |
2270 | if (l->mtu > msg_max_pkt(hdr)) |
2271 | l->mtu = msg_max_pkt(hdr); | |
2272 | break; | |
662921cd | 2273 | |
d999297c | 2274 | case STATE_MSG: |
9012de50 JM |
2275 | l->rcv_nxt_state = msg_seqno(hdr) + 1; |
2276 | ||
d999297c | 2277 | /* Update own tolerance if peer indicates a non-zero value */ |
047491ea | 2278 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { |
d999297c | 2279 | l->tolerance = peers_tol; |
047491ea JM |
2280 | l->bc_rcvlink->tolerance = peers_tol; |
2281 | } | |
f7967556 JPM |
2282 | /* Update own prio if peer indicates a different value */ |
2283 | if ((peers_prio != l->priority) && | |
2284 | in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { | |
81729810 RA |
2285 | l->priority = peers_prio; |
2286 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
2287 | } | |
2288 | ||
d999297c JPM |
2289 | l->silent_intv_cnt = 0; |
2290 | l->stats.recv_states++; | |
2291 | if (msg_probe(hdr)) | |
2292 | l->stats.recv_probes++; | |
73f646ce JPM |
2293 | |
2294 | if (!link_is_up(l)) { | |
2295 | if (l->state == LINK_ESTABLISHING) | |
2296 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 2297 | break; |
73f646ce | 2298 | } |
9195948f TL |
2299 | |
2300 | /* Receive Gap ACK blocks from peer if any */ | |
d7626b5a | 2301 | glen = tipc_get_gap_ack_blks(&ga, l, hdr, true); |
9195948f TL |
2302 | |
2303 | tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr, | |
35c55c98 | 2304 | &l->mon_state, l->bearer_id); |
d999297c | 2305 | |
662921cd | 2306 | /* Send NACK if peer has sent pkts we haven't received yet */ |
d3b09995 JM |
2307 | if ((reply || msg_is_keepalive(hdr)) && |
2308 | more(peers_snd_nxt, rcv_nxt) && | |
2309 | !tipc_link_is_synching(l) && | |
2310 | skb_queue_empty(&l->deferdq)) | |
d999297c | 2311 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
8d6e79d3 JM |
2312 | if (rcvgap || reply) |
2313 | tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, | |
2314 | rcvgap, 0, 0, xmitq); | |
d999297c | 2315 | |
d7626b5a TL |
2316 | released = tipc_link_advance_transmq(l, l, ack, gap, ga, xmitq, |
2317 | &retransmitted, &rc); | |
9195948f | 2318 | if (gap) |
d999297c | 2319 | l->stats.recv_nacks++; |
d7626b5a TL |
2320 | if (released || retransmitted) |
2321 | tipc_link_update_cwin(l, released, retransmitted); | |
2322 | if (released) | |
2323 | tipc_link_advance_backlog(l, xmitq); | |
d999297c JPM |
2324 | if (unlikely(!skb_queue_empty(&l->wakeupq))) |
2325 | link_prepare_wakeup(l); | |
2326 | } | |
2327 | exit: | |
2328 | kfree_skb(skb); | |
2329 | return rc; | |
2330 | } | |
2331 | ||
52666986 JPM |
2332 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
2333 | */ | |
2334 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
2335 | u16 peers_snd_nxt, | |
2336 | struct sk_buff_head *xmitq) | |
2337 | { | |
2338 | struct sk_buff *skb; | |
2339 | struct tipc_msg *hdr; | |
2340 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
2341 | u16 ack = l->rcv_nxt - 1; | |
2342 | u16 gap_to = peers_snd_nxt - 1; | |
2343 | ||
2344 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 2345 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
2346 | if (!skb) |
2347 | return false; | |
2348 | hdr = buf_msg(skb); | |
2349 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
2350 | msg_set_bcast_ack(hdr, ack); | |
2351 | msg_set_bcgap_after(hdr, ack); | |
2352 | if (dfrd_skb) | |
2353 | gap_to = buf_seqno(dfrd_skb) - 1; | |
2354 | msg_set_bcgap_to(hdr, gap_to); | |
2355 | msg_set_non_seq(hdr, bcast); | |
2356 | __skb_queue_tail(xmitq, skb); | |
2357 | return true; | |
2358 | } | |
2359 | ||
2360 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
2361 | * | |
2362 | * Give a newly added peer node the sequence number where it should | |
2363 | * start receiving and acking broadcast packets. | |
2364 | */ | |
742e0383 WF |
2365 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
2366 | struct sk_buff_head *xmitq) | |
52666986 JPM |
2367 | { |
2368 | struct sk_buff_head list; | |
2369 | ||
2370 | __skb_queue_head_init(&list); | |
2371 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
2372 | return; | |
06bd2b1e | 2373 | msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); |
52666986 JPM |
2374 | tipc_link_xmit(l, &list, xmitq); |
2375 | } | |
2376 | ||
2377 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
2378 | */ | |
2379 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
2380 | { | |
2381 | int mtyp = msg_type(hdr); | |
2382 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
2383 | ||
2384 | if (link_is_up(l)) | |
2385 | return; | |
2386 | ||
2387 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
2388 | l->rcv_nxt = peers_snd_nxt; | |
2389 | l->state = LINK_ESTABLISHED; | |
2390 | return; | |
2391 | } | |
2392 | ||
2393 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
2394 | return; | |
2395 | ||
2396 | if (msg_peer_node_is_up(hdr)) | |
2397 | return; | |
2398 | ||
2399 | /* Compatibility: accept older, less safe initial synch data */ | |
2400 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
2401 | l->rcv_nxt = peers_snd_nxt; | |
2402 | } | |
2403 | ||
2404 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
2405 | */ | |
02d11ca2 JPM |
2406 | int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
2407 | struct sk_buff_head *xmitq) | |
52666986 JPM |
2408 | { |
2409 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
02d11ca2 | 2410 | int rc = 0; |
52666986 JPM |
2411 | |
2412 | if (!link_is_up(l)) | |
02d11ca2 | 2413 | return rc; |
52666986 JPM |
2414 | |
2415 | if (!msg_peer_node_is_up(hdr)) | |
02d11ca2 | 2416 | return rc; |
52666986 | 2417 | |
a99df449 | 2418 | /* Open when peer acknowledges our bcast init msg (pkt #1) */ |
2d18ac4b JPM |
2419 | if (msg_ack(hdr)) |
2420 | l->bc_peer_is_up = true; | |
2421 | ||
2422 | if (!l->bc_peer_is_up) | |
02d11ca2 | 2423 | return rc; |
52666986 JPM |
2424 | |
2425 | /* Ignore if peers_snd_nxt goes beyond receive window */ | |
2426 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
02d11ca2 JPM |
2427 | return rc; |
2428 | ||
02d11ca2 JPM |
2429 | l->snd_nxt = peers_snd_nxt; |
2430 | if (link_bc_rcv_gap(l)) | |
2431 | rc |= TIPC_LINK_SND_STATE; | |
2432 | ||
2433 | /* Return now if sender supports nack via STATE messages */ | |
2434 | if (l->peer_caps & TIPC_BCAST_STATE_NACK) | |
2435 | return rc; | |
2436 | ||
2437 | /* Otherwise, be backwards compatible */ | |
52666986 JPM |
2438 | |
2439 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
2440 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
02d11ca2 | 2441 | return 0; |
52666986 JPM |
2442 | } |
2443 | ||
2444 | /* Don't NACK if one was recently sent or peeked */ | |
2445 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
2446 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
02d11ca2 | 2447 | return 0; |
52666986 JPM |
2448 | } |
2449 | ||
2450 | /* Conditionally delay NACK sending until next synch rcv */ | |
2451 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
2452 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
2453 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
02d11ca2 | 2454 | return 0; |
52666986 JPM |
2455 | } |
2456 | ||
2457 | /* Send NACK now but suppress next one */ | |
2458 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
2459 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
02d11ca2 | 2460 | return 0; |
52666986 JPM |
2461 | } |
2462 | ||
d7626b5a TL |
2463 | int tipc_link_bc_ack_rcv(struct tipc_link *r, u16 acked, u16 gap, |
2464 | struct tipc_gap_ack_blks *ga, | |
a91d55d1 TL |
2465 | struct sk_buff_head *xmitq, |
2466 | struct sk_buff_head *retrq) | |
52666986 | 2467 | { |
d7626b5a TL |
2468 | struct tipc_link *l = r->bc_sndlink; |
2469 | bool unused = false; | |
2470 | int rc = 0; | |
52666986 | 2471 | |
d7626b5a TL |
2472 | if (!link_is_up(r) || !r->bc_peer_is_up) |
2473 | return 0; | |
52666986 | 2474 | |
03b6fefd TL |
2475 | if (gap) { |
2476 | l->stats.recv_nacks++; | |
2477 | r->stats.recv_nacks++; | |
2478 | } | |
2479 | ||
d7626b5a TL |
2480 | if (less(acked, r->acked) || (acked == r->acked && !gap && !ga)) |
2481 | return 0; | |
52666986 | 2482 | |
c6ed7a5c | 2483 | trace_tipc_link_bc_ack(r, acked, gap, &l->transmq); |
a91d55d1 | 2484 | tipc_link_advance_transmq(l, r, acked, gap, ga, retrq, &unused, &rc); |
52666986 | 2485 | |
d7626b5a TL |
2486 | tipc_link_advance_backlog(l, xmitq); |
2487 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
2488 | link_prepare_wakeup(l); | |
2489 | ||
2490 | return rc; | |
52666986 JPM |
2491 | } |
2492 | ||
2493 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
02d11ca2 JPM |
2494 | * This function is here for backwards compatibility, since |
2495 | * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. | |
52666986 JPM |
2496 | */ |
2497 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
2498 | struct sk_buff_head *xmitq) | |
2499 | { | |
2500 | struct tipc_msg *hdr = buf_msg(skb); | |
2501 | u32 dnode = msg_destnode(hdr); | |
2502 | int mtyp = msg_type(hdr); | |
2503 | u16 acked = msg_bcast_ack(hdr); | |
2504 | u16 from = acked + 1; | |
2505 | u16 to = msg_bcgap_to(hdr); | |
2506 | u16 peers_snd_nxt = to + 1; | |
2507 | int rc = 0; | |
2508 | ||
2509 | kfree_skb(skb); | |
2510 | ||
2511 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
2512 | return 0; | |
2513 | ||
2514 | if (mtyp != STATE_MSG) | |
2515 | return 0; | |
2516 | ||
e74a386d | 2517 | if (dnode == tipc_own_addr(l->net)) { |
a91d55d1 TL |
2518 | rc = tipc_link_bc_ack_rcv(l, acked, to - acked, NULL, xmitq, |
2519 | xmitq); | |
52666986 JPM |
2520 | l->stats.recv_nacks++; |
2521 | return rc; | |
2522 | } | |
2523 | ||
2524 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
2525 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
2526 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
2527 | ||
2528 | return 0; | |
2529 | } | |
2530 | ||
16ad3f40 | 2531 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 min_win, u32 max_win) |
b97bf3fd | 2532 | { |
218527fe | 2533 | int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE); |
e3eea1eb | 2534 | |
16ad3f40 JM |
2535 | l->min_win = min_win; |
2536 | l->ssthresh = max_win; | |
2537 | l->max_win = max_win; | |
2538 | l->window = min_win; | |
2539 | l->backlog[TIPC_LOW_IMPORTANCE].limit = min_win * 2; | |
2540 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = min_win * 4; | |
2541 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = min_win * 6; | |
2542 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = min_win * 8; | |
1f66d161 | 2543 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
b97bf3fd PL |
2544 | } |
2545 | ||
b97bf3fd | 2546 | /** |
25764779 | 2547 | * tipc_link_reset_stats - reset link statistics |
1a90632d | 2548 | * @l: pointer to link |
b97bf3fd | 2549 | */ |
38206d59 | 2550 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 2551 | { |
38206d59 | 2552 | memset(&l->stats, 0, sizeof(l->stats)); |
b97bf3fd PL |
2553 | } |
2554 | ||
1a20cc25 | 2555 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 2556 | { |
1a20cc25 | 2557 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 2558 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 2559 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 2560 | |
662921cd | 2561 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
2562 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
2563 | skb_queue_len(&l->transmq), head, tail, | |
2564 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 2565 | } |
0655f6a8 RA |
2566 | |
2567 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
2568 | */ | |
2569 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
2570 | { | |
2571 | int err; | |
2572 | ||
8cb08174 JB |
2573 | err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop, |
2574 | tipc_nl_prop_policy, NULL); | |
0655f6a8 RA |
2575 | if (err) |
2576 | return err; | |
2577 | ||
2578 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2579 | u32 prio; | |
2580 | ||
2581 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2582 | if (prio > TIPC_MAX_LINK_PRI) | |
2583 | return -EINVAL; | |
2584 | } | |
2585 | ||
2586 | if (props[TIPC_NLA_PROP_TOL]) { | |
2587 | u32 tol; | |
2588 | ||
2589 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2590 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
2591 | return -EINVAL; | |
2592 | } | |
2593 | ||
2594 | if (props[TIPC_NLA_PROP_WIN]) { | |
16ad3f40 | 2595 | u32 max_win; |
0655f6a8 | 2596 | |
16ad3f40 JM |
2597 | max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
2598 | if (max_win < TIPC_DEF_LINK_WIN || max_win > TIPC_MAX_LINK_WIN) | |
0655f6a8 RA |
2599 | return -EINVAL; |
2600 | } | |
2601 | ||
2602 | return 0; | |
2603 | } | |
7be57fc6 | 2604 | |
d8182804 | 2605 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
2606 | { |
2607 | int i; | |
2608 | struct nlattr *stats; | |
2609 | ||
2610 | struct nla_map { | |
2611 | u32 key; | |
2612 | u32 val; | |
2613 | }; | |
2614 | ||
2615 | struct nla_map map[] = { | |
95901122 | 2616 | {TIPC_NLA_STATS_RX_INFO, 0}, |
7be57fc6 RA |
2617 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
2618 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2619 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2620 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
95901122 | 2621 | {TIPC_NLA_STATS_TX_INFO, 0}, |
7be57fc6 RA |
2622 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
2623 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2624 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2625 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2626 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2627 | s->msg_length_counts : 1}, | |
2628 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2629 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2630 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2631 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2632 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2633 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2634 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2635 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2636 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2637 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2638 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2639 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2640 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2641 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2642 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2643 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2644 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2645 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2646 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2647 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2648 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2649 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2650 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2651 | }; | |
2652 | ||
ae0be8de | 2653 | stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
7be57fc6 RA |
2654 | if (!stats) |
2655 | return -EMSGSIZE; | |
2656 | ||
2657 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2658 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2659 | goto msg_full; | |
2660 | ||
2661 | nla_nest_end(skb, stats); | |
2662 | ||
2663 | return 0; | |
2664 | msg_full: | |
2665 | nla_nest_cancel(skb, stats); | |
2666 | ||
2667 | return -EMSGSIZE; | |
2668 | } | |
2669 | ||
2670 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
2671 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2672 | struct tipc_link *link, int nlflags) | |
7be57fc6 | 2673 | { |
23fd3eac | 2674 | u32 self = tipc_own_addr(net); |
7be57fc6 RA |
2675 | struct nlattr *attrs; |
2676 | struct nlattr *prop; | |
23fd3eac JM |
2677 | void *hdr; |
2678 | int err; | |
7be57fc6 | 2679 | |
bfb3e5dd | 2680 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 2681 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
2682 | if (!hdr) |
2683 | return -EMSGSIZE; | |
2684 | ||
ae0be8de | 2685 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
7be57fc6 RA |
2686 | if (!attrs) |
2687 | goto msg_full; | |
2688 | ||
2689 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2690 | goto attr_msg_full; | |
23fd3eac | 2691 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self))) |
7be57fc6 | 2692 | goto attr_msg_full; |
ed193ece | 2693 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 2694 | goto attr_msg_full; |
95901122 | 2695 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) |
7be57fc6 | 2696 | goto attr_msg_full; |
95901122 | 2697 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) |
7be57fc6 RA |
2698 | goto attr_msg_full; |
2699 | ||
2700 | if (tipc_link_is_up(link)) | |
2701 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2702 | goto attr_msg_full; | |
c72fa872 | 2703 | if (link->active) |
7be57fc6 RA |
2704 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
2705 | goto attr_msg_full; | |
2706 | ||
ae0be8de | 2707 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
7be57fc6 RA |
2708 | if (!prop) |
2709 | goto attr_msg_full; | |
2710 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2711 | goto prop_msg_full; | |
2712 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2713 | goto prop_msg_full; | |
2714 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2715 | link->window)) |
7be57fc6 RA |
2716 | goto prop_msg_full; |
2717 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2718 | goto prop_msg_full; | |
2719 | nla_nest_end(msg->skb, prop); | |
2720 | ||
2721 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2722 | if (err) | |
2723 | goto attr_msg_full; | |
2724 | ||
2725 | nla_nest_end(msg->skb, attrs); | |
2726 | genlmsg_end(msg->skb, hdr); | |
2727 | ||
2728 | return 0; | |
2729 | ||
2730 | prop_msg_full: | |
2731 | nla_nest_cancel(msg->skb, prop); | |
2732 | attr_msg_full: | |
2733 | nla_nest_cancel(msg->skb, attrs); | |
2734 | msg_full: | |
2735 | genlmsg_cancel(msg->skb, hdr); | |
2736 | ||
2737 | return -EMSGSIZE; | |
2738 | } | |
38206d59 JPM |
2739 | |
2740 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
2741 | struct tipc_stats *stats) | |
2742 | { | |
2743 | int i; | |
2744 | struct nlattr *nest; | |
2745 | ||
2746 | struct nla_map { | |
2747 | __u32 key; | |
2748 | __u32 val; | |
2749 | }; | |
2750 | ||
2751 | struct nla_map map[] = { | |
95901122 | 2752 | {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, |
38206d59 JPM |
2753 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
2754 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
2755 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
2756 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
95901122 | 2757 | {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, |
38206d59 JPM |
2758 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
2759 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
2760 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
2761 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
2762 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
2763 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
2764 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
2765 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
2766 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
2767 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
2768 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
2769 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
2770 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
2771 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
2772 | }; | |
2773 | ||
ae0be8de | 2774 | nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
38206d59 JPM |
2775 | if (!nest) |
2776 | return -EMSGSIZE; | |
2777 | ||
2778 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2779 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2780 | goto msg_full; | |
2781 | ||
2782 | nla_nest_end(skb, nest); | |
2783 | ||
2784 | return 0; | |
2785 | msg_full: | |
2786 | nla_nest_cancel(skb, nest); | |
2787 | ||
2788 | return -EMSGSIZE; | |
2789 | } | |
2790 | ||
03b6fefd TL |
2791 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg, |
2792 | struct tipc_link *bcl) | |
38206d59 JPM |
2793 | { |
2794 | int err; | |
2795 | void *hdr; | |
2796 | struct nlattr *attrs; | |
2797 | struct nlattr *prop; | |
cad2929d | 2798 | u32 bc_mode = tipc_bcast_get_mode(net); |
02ec6caf | 2799 | u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net); |
38206d59 JPM |
2800 | |
2801 | if (!bcl) | |
2802 | return 0; | |
2803 | ||
2804 | tipc_bcast_lock(net); | |
2805 | ||
2806 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2807 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
2808 | if (!hdr) { |
2809 | tipc_bcast_unlock(net); | |
38206d59 | 2810 | return -EMSGSIZE; |
b53ce3e7 | 2811 | } |
38206d59 | 2812 | |
ae0be8de | 2813 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
38206d59 JPM |
2814 | if (!attrs) |
2815 | goto msg_full; | |
2816 | ||
2817 | /* The broadcast link is always up */ | |
2818 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2819 | goto attr_msg_full; | |
2820 | ||
2821 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
2822 | goto attr_msg_full; | |
2823 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
2824 | goto attr_msg_full; | |
95901122 | 2825 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) |
38206d59 | 2826 | goto attr_msg_full; |
95901122 | 2827 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) |
38206d59 JPM |
2828 | goto attr_msg_full; |
2829 | ||
ae0be8de | 2830 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
38206d59 JPM |
2831 | if (!prop) |
2832 | goto attr_msg_full; | |
16ad3f40 | 2833 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->max_win)) |
38206d59 | 2834 | goto prop_msg_full; |
02ec6caf HL |
2835 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode)) |
2836 | goto prop_msg_full; | |
2837 | if (bc_mode & BCLINK_MODE_SEL) | |
2838 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO, | |
2839 | bc_ratio)) | |
2840 | goto prop_msg_full; | |
38206d59 JPM |
2841 | nla_nest_end(msg->skb, prop); |
2842 | ||
2843 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2844 | if (err) | |
2845 | goto attr_msg_full; | |
2846 | ||
2847 | tipc_bcast_unlock(net); | |
2848 | nla_nest_end(msg->skb, attrs); | |
2849 | genlmsg_end(msg->skb, hdr); | |
2850 | ||
2851 | return 0; | |
2852 | ||
2853 | prop_msg_full: | |
2854 | nla_nest_cancel(msg->skb, prop); | |
2855 | attr_msg_full: | |
2856 | nla_nest_cancel(msg->skb, attrs); | |
2857 | msg_full: | |
2858 | tipc_bcast_unlock(net); | |
2859 | genlmsg_cancel(msg->skb, hdr); | |
2860 | ||
2861 | return -EMSGSIZE; | |
2862 | } | |
2863 | ||
d01332f1 RA |
2864 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
2865 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2866 | { |
2867 | l->tolerance = tol; | |
047491ea JM |
2868 | if (l->bc_rcvlink) |
2869 | l->bc_rcvlink->tolerance = tol; | |
37c64cf6 JM |
2870 | if (link_is_up(l)) |
2871 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); | |
38206d59 JPM |
2872 | } |
2873 | ||
d01332f1 RA |
2874 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2875 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2876 | { |
2877 | l->priority = prio; | |
8d6e79d3 | 2878 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2879 | } |
2880 | ||
2881 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2882 | { | |
2883 | l->abort_limit = limit; | |
2884 | } | |
b4b9771b | 2885 | |
b4b9771b TL |
2886 | /** |
2887 | * tipc_link_dump - dump TIPC link data | |
2888 | * @l: tipc link to be dumped | |
2889 | * @dqueues: bitmask to decide if any link queue to be dumped? | |
2890 | * - TIPC_DUMP_NONE: don't dump link queues | |
2891 | * - TIPC_DUMP_TRANSMQ: dump link transmq queue | |
2892 | * - TIPC_DUMP_BACKLOGQ: dump link backlog queue | |
2893 | * - TIPC_DUMP_DEFERDQ: dump link deferd queue | |
2894 | * - TIPC_DUMP_INPUTQ: dump link input queue | |
2895 | * - TIPC_DUMP_WAKEUP: dump link wakeup queue | |
2896 | * - TIPC_DUMP_ALL: dump all the link queues above | |
2897 | * @buf: returned buffer of dump data in format | |
2898 | */ | |
2899 | int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf) | |
2900 | { | |
2901 | int i = 0; | |
2902 | size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN; | |
2903 | struct sk_buff_head *list; | |
2904 | struct sk_buff *hskb, *tskb; | |
2905 | u32 len; | |
2906 | ||
2907 | if (!l) { | |
2908 | i += scnprintf(buf, sz, "link data: (null)\n"); | |
2909 | return i; | |
2910 | } | |
2911 | ||
2912 | i += scnprintf(buf, sz, "link data: %x", l->addr); | |
2913 | i += scnprintf(buf + i, sz - i, " %x", l->state); | |
2914 | i += scnprintf(buf + i, sz - i, " %u", l->in_session); | |
2915 | i += scnprintf(buf + i, sz - i, " %u", l->session); | |
2916 | i += scnprintf(buf + i, sz - i, " %u", l->peer_session); | |
2917 | i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt); | |
2918 | i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt); | |
2919 | i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state); | |
2920 | i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state); | |
2921 | i += scnprintf(buf + i, sz - i, " %x", l->peer_caps); | |
2922 | i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt); | |
2923 | i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt); | |
71204231 | 2924 | i += scnprintf(buf + i, sz - i, " %u", 0); |
77cf8edb | 2925 | i += scnprintf(buf + i, sz - i, " %u", 0); |
b4b9771b TL |
2926 | i += scnprintf(buf + i, sz - i, " %u", l->acked); |
2927 | ||
2928 | list = &l->transmq; | |
2929 | len = skb_queue_len(list); | |
2930 | hskb = skb_peek(list); | |
2931 | tskb = skb_peek_tail(list); | |
2932 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2933 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2934 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2935 | ||
2936 | list = &l->deferdq; | |
2937 | len = skb_queue_len(list); | |
2938 | hskb = skb_peek(list); | |
2939 | tskb = skb_peek_tail(list); | |
2940 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2941 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2942 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2943 | ||
2944 | list = &l->backlogq; | |
2945 | len = skb_queue_len(list); | |
2946 | hskb = skb_peek(list); | |
2947 | tskb = skb_peek_tail(list); | |
2948 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2949 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2950 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2951 | ||
2952 | list = l->inputq; | |
2953 | len = skb_queue_len(list); | |
2954 | hskb = skb_peek(list); | |
2955 | tskb = skb_peek_tail(list); | |
2956 | i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len, | |
2957 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2958 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2959 | ||
2960 | if (dqueues & TIPC_DUMP_TRANSMQ) { | |
2961 | i += scnprintf(buf + i, sz - i, "transmq: "); | |
2962 | i += tipc_list_dump(&l->transmq, false, buf + i); | |
2963 | } | |
2964 | if (dqueues & TIPC_DUMP_BACKLOGQ) { | |
2965 | i += scnprintf(buf + i, sz - i, | |
2966 | "backlogq: <%u %u %u %u %u>, ", | |
2967 | l->backlog[TIPC_LOW_IMPORTANCE].len, | |
2968 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len, | |
2969 | l->backlog[TIPC_HIGH_IMPORTANCE].len, | |
2970 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len, | |
2971 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len); | |
2972 | i += tipc_list_dump(&l->backlogq, false, buf + i); | |
2973 | } | |
2974 | if (dqueues & TIPC_DUMP_DEFERDQ) { | |
2975 | i += scnprintf(buf + i, sz - i, "deferdq: "); | |
2976 | i += tipc_list_dump(&l->deferdq, false, buf + i); | |
2977 | } | |
2978 | if (dqueues & TIPC_DUMP_INPUTQ) { | |
2979 | i += scnprintf(buf + i, sz - i, "inputq: "); | |
2980 | i += tipc_list_dump(l->inputq, false, buf + i); | |
2981 | } | |
2982 | if (dqueues & TIPC_DUMP_WAKEUP) { | |
2983 | i += scnprintf(buf + i, sz - i, "wakeup: "); | |
2984 | i += tipc_list_dump(&l->wakeupq, false, buf + i); | |
2985 | } | |
2986 | ||
2987 | return i; | |
2988 | } |