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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
e74a386d | 4 | * Copyright (c) 1996-2007, 2012-2016, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
35c55c98 | 45 | #include "monitor.h" |
b97bf3fd | 46 | |
796c75d0 YX |
47 | #include <linux/pkt_sched.h> |
48 | ||
38206d59 | 49 | struct tipc_stats { |
95901122 JPM |
50 | u32 sent_pkts; |
51 | u32 recv_pkts; | |
38206d59 JPM |
52 | u32 sent_states; |
53 | u32 recv_states; | |
54 | u32 sent_probes; | |
55 | u32 recv_probes; | |
56 | u32 sent_nacks; | |
57 | u32 recv_nacks; | |
58 | u32 sent_acks; | |
59 | u32 sent_bundled; | |
60 | u32 sent_bundles; | |
61 | u32 recv_bundled; | |
62 | u32 recv_bundles; | |
63 | u32 retransmitted; | |
64 | u32 sent_fragmented; | |
65 | u32 sent_fragments; | |
66 | u32 recv_fragmented; | |
67 | u32 recv_fragments; | |
68 | u32 link_congs; /* # port sends blocked by congestion */ | |
69 | u32 deferred_recv; | |
70 | u32 duplicates; | |
71 | u32 max_queue_sz; /* send queue size high water mark */ | |
72 | u32 accu_queue_sz; /* used for send queue size profiling */ | |
73 | u32 queue_sz_counts; /* used for send queue size profiling */ | |
74 | u32 msg_length_counts; /* used for message length profiling */ | |
75 | u32 msg_lengths_total; /* used for message length profiling */ | |
76 | u32 msg_length_profile[7]; /* used for msg. length profiling */ | |
77 | }; | |
78 | ||
79 | /** | |
80 | * struct tipc_link - TIPC link data structure | |
81 | * @addr: network address of link's peer node | |
82 | * @name: link name character string | |
83 | * @media_addr: media address to use when sending messages over link | |
84 | * @timer: link timer | |
85 | * @net: pointer to namespace struct | |
86 | * @refcnt: reference counter for permanent references (owner node & timer) | |
87 | * @peer_session: link session # being used by peer end of link | |
88 | * @peer_bearer_id: bearer id used by link's peer endpoint | |
89 | * @bearer_id: local bearer id used by link | |
90 | * @tolerance: minimum link continuity loss needed to reset link [in ms] | |
38206d59 JPM |
91 | * @abort_limit: # of unacknowledged continuity probes needed to reset link |
92 | * @state: current state of link FSM | |
93 | * @peer_caps: bitmap describing capabilities of peer node | |
94 | * @silent_intv_cnt: # of timer intervals without any reception from peer | |
95 | * @proto_msg: template for control messages generated by link | |
96 | * @pmsg: convenience pointer to "proto_msg" field | |
97 | * @priority: current link priority | |
98 | * @net_plane: current link network plane ('A' through 'H') | |
35c55c98 | 99 | * @mon_state: cookie with information needed by link monitor |
38206d59 JPM |
100 | * @backlog_limit: backlog queue congestion thresholds (indexed by importance) |
101 | * @exp_msg_count: # of tunnelled messages expected during link changeover | |
102 | * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset | |
103 | * @mtu: current maximum packet size for this link | |
104 | * @advertised_mtu: advertised own mtu when link is being established | |
105 | * @transmitq: queue for sent, non-acked messages | |
106 | * @backlogq: queue for messages waiting to be sent | |
107 | * @snt_nxt: next sequence number to use for outbound messages | |
108 | * @last_retransmitted: sequence number of most recently retransmitted message | |
109 | * @stale_count: # of identical retransmit requests made by peer | |
110 | * @ackers: # of peers that needs to ack each packet before it can be released | |
111 | * @acked: # last packet acked by a certain peer. Used for broadcast. | |
112 | * @rcv_nxt: next sequence number to expect for inbound messages | |
113 | * @deferred_queue: deferred queue saved OOS b'cast message received from node | |
114 | * @unacked_window: # of inbound messages rx'd without ack'ing back to peer | |
115 | * @inputq: buffer queue for messages to be delivered upwards | |
116 | * @namedq: buffer queue for name table messages to be delivered upwards | |
117 | * @next_out: ptr to first unsent outbound message in queue | |
118 | * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate | |
119 | * @long_msg_seq_no: next identifier to use for outbound fragmented messages | |
120 | * @reasm_buf: head of partially reassembled inbound message fragments | |
121 | * @bc_rcvr: marks that this is a broadcast receiver link | |
122 | * @stats: collects statistics regarding link activity | |
123 | */ | |
124 | struct tipc_link { | |
125 | u32 addr; | |
126 | char name[TIPC_MAX_LINK_NAME]; | |
38206d59 JPM |
127 | struct net *net; |
128 | ||
129 | /* Management and link supervision data */ | |
130 | u32 peer_session; | |
e74a386d | 131 | u32 session; |
38206d59 JPM |
132 | u32 peer_bearer_id; |
133 | u32 bearer_id; | |
134 | u32 tolerance; | |
38206d59 JPM |
135 | u32 abort_limit; |
136 | u32 state; | |
137 | u16 peer_caps; | |
138 | bool active; | |
139 | u32 silent_intv_cnt; | |
e74a386d | 140 | char if_name[TIPC_MAX_IF_NAME]; |
38206d59 JPM |
141 | u32 priority; |
142 | char net_plane; | |
35c55c98 | 143 | struct tipc_mon_state mon_state; |
88e8ac70 | 144 | u16 rst_cnt; |
38206d59 JPM |
145 | |
146 | /* Failover/synch */ | |
147 | u16 drop_point; | |
148 | struct sk_buff *failover_reasm_skb; | |
149 | ||
150 | /* Max packet negotiation */ | |
151 | u16 mtu; | |
152 | u16 advertised_mtu; | |
153 | ||
154 | /* Sending */ | |
155 | struct sk_buff_head transmq; | |
156 | struct sk_buff_head backlogq; | |
157 | struct { | |
158 | u16 len; | |
159 | u16 limit; | |
160 | } backlog[5]; | |
161 | u16 snd_nxt; | |
162 | u16 last_retransm; | |
163 | u16 window; | |
164 | u32 stale_count; | |
165 | ||
166 | /* Reception */ | |
167 | u16 rcv_nxt; | |
168 | u32 rcv_unacked; | |
169 | struct sk_buff_head deferdq; | |
170 | struct sk_buff_head *inputq; | |
171 | struct sk_buff_head *namedq; | |
172 | ||
173 | /* Congestion handling */ | |
174 | struct sk_buff_head wakeupq; | |
175 | ||
176 | /* Fragmentation/reassembly */ | |
177 | struct sk_buff *reasm_buf; | |
178 | ||
179 | /* Broadcast */ | |
180 | u16 ackers; | |
181 | u16 acked; | |
182 | struct tipc_link *bc_rcvlink; | |
183 | struct tipc_link *bc_sndlink; | |
7c4a54b9 JPM |
184 | unsigned long prev_retr; |
185 | u16 prev_from; | |
186 | u16 prev_to; | |
187 | u8 nack_state; | |
38206d59 JPM |
188 | bool bc_peer_is_up; |
189 | ||
190 | /* Statistics */ | |
191 | struct tipc_stats stats; | |
192 | }; | |
193 | ||
2cf8aa19 EH |
194 | /* |
195 | * Error message prefixes | |
196 | */ | |
6e498158 | 197 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 198 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 199 | |
52666986 JPM |
200 | /* Send states for broadcast NACKs |
201 | */ | |
202 | enum { | |
203 | BC_NACK_SND_CONDITIONAL, | |
204 | BC_NACK_SND_UNCONDITIONAL, | |
205 | BC_NACK_SND_SUPPRESS, | |
206 | }; | |
207 | ||
7c4a54b9 JPM |
208 | #define TIPC_BC_RETR_LIMIT 10 /* [ms] */ |
209 | ||
d999297c JPM |
210 | /* |
211 | * Interval between NACKs when packets arrive out of order | |
212 | */ | |
213 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
e74a386d JPM |
214 | |
215 | /* Wildcard value for link session numbers. When it is known that | |
216 | * peer endpoint is down, any session number must be accepted. | |
a686e685 | 217 | */ |
e74a386d | 218 | #define ANY_SESSION 0x10000 |
a686e685 | 219 | |
662921cd | 220 | /* Link FSM states: |
b97bf3fd | 221 | */ |
d3504c34 | 222 | enum { |
662921cd JPM |
223 | LINK_ESTABLISHED = 0xe, |
224 | LINK_ESTABLISHING = 0xe << 4, | |
225 | LINK_RESET = 0x1 << 8, | |
226 | LINK_RESETTING = 0x2 << 12, | |
227 | LINK_PEER_RESET = 0xd << 16, | |
228 | LINK_FAILINGOVER = 0xf << 20, | |
229 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
230 | }; |
231 | ||
232 | /* Link FSM state checking routines | |
233 | */ | |
662921cd | 234 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 235 | { |
662921cd | 236 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 237 | } |
b97bf3fd | 238 | |
d999297c JPM |
239 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
240 | struct sk_buff_head *xmitq); | |
426cc2b8 | 241 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
242 | bool probe_reply, u16 rcvgap, |
243 | int tolerance, int priority, | |
426cc2b8 | 244 | struct sk_buff_head *xmitq); |
1a90632d | 245 | static void link_print(struct tipc_link *l, const char *str); |
e0a05ebe JPM |
246 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
247 | struct sk_buff_head *xmitq); | |
52666986 JPM |
248 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
249 | struct sk_buff_head *xmitq); | |
250 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
8b4ed863 | 251 | |
b97bf3fd | 252 | /* |
05790c64 | 253 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 254 | */ |
662921cd | 255 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 256 | { |
662921cd JPM |
257 | return link_is_up(l); |
258 | } | |
259 | ||
c8199300 JPM |
260 | bool tipc_link_peer_is_down(struct tipc_link *l) |
261 | { | |
262 | return l->state == LINK_PEER_RESET; | |
263 | } | |
264 | ||
662921cd JPM |
265 | bool tipc_link_is_reset(struct tipc_link *l) |
266 | { | |
267 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
268 | } | |
269 | ||
73f646ce JPM |
270 | bool tipc_link_is_establishing(struct tipc_link *l) |
271 | { | |
272 | return l->state == LINK_ESTABLISHING; | |
273 | } | |
274 | ||
662921cd JPM |
275 | bool tipc_link_is_synching(struct tipc_link *l) |
276 | { | |
277 | return l->state == LINK_SYNCHING; | |
278 | } | |
279 | ||
280 | bool tipc_link_is_failingover(struct tipc_link *l) | |
281 | { | |
282 | return l->state == LINK_FAILINGOVER; | |
283 | } | |
284 | ||
285 | bool tipc_link_is_blocked(struct tipc_link *l) | |
286 | { | |
287 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
288 | } |
289 | ||
742e0383 | 290 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
291 | { |
292 | return !l->bc_sndlink; | |
293 | } | |
294 | ||
742e0383 | 295 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
296 | { |
297 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
298 | } | |
299 | ||
9d13ec65 | 300 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 301 | { |
c72fa872 JPM |
302 | return l->active; |
303 | } | |
9d13ec65 | 304 | |
c72fa872 JPM |
305 | void tipc_link_set_active(struct tipc_link *l, bool active) |
306 | { | |
307 | l->active = active; | |
b97bf3fd PL |
308 | } |
309 | ||
38206d59 JPM |
310 | u32 tipc_link_id(struct tipc_link *l) |
311 | { | |
312 | return l->peer_bearer_id << 16 | l->bearer_id; | |
313 | } | |
314 | ||
315 | int tipc_link_window(struct tipc_link *l) | |
316 | { | |
317 | return l->window; | |
318 | } | |
319 | ||
320 | int tipc_link_prio(struct tipc_link *l) | |
321 | { | |
322 | return l->priority; | |
323 | } | |
324 | ||
325 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
326 | { | |
327 | return l->tolerance; | |
328 | } | |
329 | ||
330 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
331 | { | |
332 | return l->inputq; | |
333 | } | |
334 | ||
335 | char tipc_link_plane(struct tipc_link *l) | |
336 | { | |
337 | return l->net_plane; | |
338 | } | |
339 | ||
52666986 JPM |
340 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
341 | struct tipc_link *uc_l, | |
342 | struct sk_buff_head *xmitq) | |
2f566124 | 343 | { |
52666986 JPM |
344 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
345 | ||
346 | snd_l->ackers++; | |
347 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 348 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 349 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
350 | } |
351 | ||
52666986 JPM |
352 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
353 | struct tipc_link *rcv_l, | |
354 | struct sk_buff_head *xmitq) | |
2f566124 | 355 | { |
52666986 JPM |
356 | u16 ack = snd_l->snd_nxt - 1; |
357 | ||
358 | snd_l->ackers--; | |
a71eb720 JPM |
359 | rcv_l->bc_peer_is_up = true; |
360 | rcv_l->state = LINK_ESTABLISHED; | |
52666986 JPM |
361 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); |
362 | tipc_link_reset(rcv_l); | |
363 | rcv_l->state = LINK_RESET; | |
364 | if (!snd_l->ackers) { | |
365 | tipc_link_reset(snd_l); | |
9a650838 | 366 | snd_l->state = LINK_RESET; |
52666986 JPM |
367 | __skb_queue_purge(xmitq); |
368 | } | |
2f566124 JPM |
369 | } |
370 | ||
371 | int tipc_link_bc_peers(struct tipc_link *l) | |
372 | { | |
373 | return l->ackers; | |
374 | } | |
375 | ||
02d11ca2 JPM |
376 | u16 link_bc_rcv_gap(struct tipc_link *l) |
377 | { | |
378 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
379 | u16 gap = 0; | |
380 | ||
381 | if (more(l->snd_nxt, l->rcv_nxt)) | |
382 | gap = l->snd_nxt - l->rcv_nxt; | |
383 | if (skb) | |
384 | gap = buf_seqno(skb) - l->rcv_nxt; | |
385 | return gap; | |
386 | } | |
387 | ||
959e1781 JPM |
388 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
389 | { | |
390 | l->mtu = mtu; | |
391 | } | |
392 | ||
393 | int tipc_link_mtu(struct tipc_link *l) | |
394 | { | |
395 | return l->mtu; | |
396 | } | |
397 | ||
38206d59 JPM |
398 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
399 | { | |
400 | return l->rcv_nxt; | |
401 | } | |
402 | ||
403 | u16 tipc_link_acked(struct tipc_link *l) | |
404 | { | |
405 | return l->acked; | |
406 | } | |
407 | ||
408 | char *tipc_link_name(struct tipc_link *l) | |
409 | { | |
410 | return l->name; | |
411 | } | |
412 | ||
b97bf3fd | 413 | /** |
4323add6 | 414 | * tipc_link_create - create a new link |
440d8963 | 415 | * @n: pointer to associated node |
0e05498e JPM |
416 | * @if_name: associated interface name |
417 | * @bearer_id: id (index) of associated bearer | |
418 | * @tolerance: link tolerance to be used by link | |
419 | * @net_plane: network plane (A,B,c..) this link belongs to | |
420 | * @mtu: mtu to be advertised by link | |
421 | * @priority: priority to be used by link | |
422 | * @window: send window to be used by link | |
423 | * @session: session to be used by link | |
440d8963 | 424 | * @ownnode: identity of own node |
0e05498e | 425 | * @peer: node id of peer node |
fd556f20 | 426 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
427 | * @bc_sndlink: the namespace global link used for broadcast sending |
428 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
429 | * @inputq: queue to put messages ready for delivery |
430 | * @namedq: queue to put binding table update messages ready for delivery | |
431 | * @link: return value, pointer to put the created link | |
c4307285 | 432 | * |
440d8963 | 433 | * Returns true if link was created, otherwise false |
b97bf3fd | 434 | */ |
c72fa872 | 435 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e | 436 | int tolerance, char net_plane, u32 mtu, int priority, |
25b0b9c4 JM |
437 | int window, u32 session, u32 self, |
438 | u32 peer, u8 *peer_id, u16 peer_caps, | |
52666986 JPM |
439 | struct tipc_link *bc_sndlink, |
440 | struct tipc_link *bc_rcvlink, | |
441 | struct sk_buff_head *inputq, | |
442 | struct sk_buff_head *namedq, | |
440d8963 | 443 | struct tipc_link **link) |
b97bf3fd | 444 | { |
25b0b9c4 JM |
445 | char peer_str[NODE_ID_STR_LEN] = {0,}; |
446 | char self_str[NODE_ID_STR_LEN] = {0,}; | |
440d8963 | 447 | struct tipc_link *l; |
37b9c08a | 448 | |
440d8963 JPM |
449 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
450 | if (!l) | |
451 | return false; | |
452 | *link = l; | |
e74a386d | 453 | l->session = session; |
37b9c08a | 454 | |
25b0b9c4 JM |
455 | /* Set link name for unicast links only */ |
456 | if (peer_id) { | |
457 | tipc_nodeid2string(self_str, tipc_own_id(net)); | |
458 | if (strlen(self_str) > 16) | |
459 | sprintf(self_str, "%x", self); | |
460 | tipc_nodeid2string(peer_str, peer_id); | |
461 | if (strlen(peer_str) > 16) | |
462 | sprintf(peer_str, "%x", peer); | |
463 | } | |
464 | /* Peer i/f name will be completed by reset/activate message */ | |
465 | sprintf(l->name, "%s:%s-%s:unknown", self_str, if_name, peer_str); | |
466 | ||
e74a386d | 467 | strcpy(l->if_name, if_name); |
440d8963 | 468 | l->addr = peer; |
fd556f20 | 469 | l->peer_caps = peer_caps; |
c72fa872 | 470 | l->net = net; |
e74a386d | 471 | l->peer_session = ANY_SESSION; |
0e05498e JPM |
472 | l->bearer_id = bearer_id; |
473 | l->tolerance = tolerance; | |
474 | l->net_plane = net_plane; | |
475 | l->advertised_mtu = mtu; | |
476 | l->mtu = mtu; | |
477 | l->priority = priority; | |
478 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 479 | l->ackers = 1; |
52666986 JPM |
480 | l->bc_sndlink = bc_sndlink; |
481 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
482 | l->inputq = inputq; |
483 | l->namedq = namedq; | |
484 | l->state = LINK_RESETTING; | |
440d8963 JPM |
485 | __skb_queue_head_init(&l->transmq); |
486 | __skb_queue_head_init(&l->backlogq); | |
487 | __skb_queue_head_init(&l->deferdq); | |
488 | skb_queue_head_init(&l->wakeupq); | |
489 | skb_queue_head_init(l->inputq); | |
490 | return true; | |
b97bf3fd PL |
491 | } |
492 | ||
32301906 JPM |
493 | /** |
494 | * tipc_link_bc_create - create new link to be used for broadcast | |
495 | * @n: pointer to associated node | |
4c94cc2d | 496 | * @mtu: mtu to be used initially if no peers |
32301906 JPM |
497 | * @window: send window to be used |
498 | * @inputq: queue to put messages ready for delivery | |
499 | * @namedq: queue to put binding table update messages ready for delivery | |
500 | * @link: return value, pointer to put the created link | |
501 | * | |
502 | * Returns true if link was created, otherwise false | |
503 | */ | |
c72fa872 | 504 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 505 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
506 | struct sk_buff_head *inputq, |
507 | struct sk_buff_head *namedq, | |
52666986 | 508 | struct tipc_link *bc_sndlink, |
32301906 JPM |
509 | struct tipc_link **link) |
510 | { | |
511 | struct tipc_link *l; | |
512 | ||
c72fa872 | 513 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
25b0b9c4 | 514 | 0, ownnode, peer, NULL, peer_caps, bc_sndlink, |
52666986 | 515 | NULL, inputq, namedq, link)) |
32301906 JPM |
516 | return false; |
517 | ||
518 | l = *link; | |
519 | strcpy(l->name, tipc_bclink_name); | |
520 | tipc_link_reset(l); | |
52666986 | 521 | l->state = LINK_RESET; |
2f566124 | 522 | l->ackers = 0; |
52666986 | 523 | l->bc_rcvlink = l; |
32301906 | 524 | |
52666986 JPM |
525 | /* Broadcast send link is always up */ |
526 | if (link_is_bc_sndlink(l)) | |
527 | l->state = LINK_ESTABLISHED; | |
d999297c | 528 | |
01fd12bb JPM |
529 | /* Disable replicast if even a single peer doesn't support it */ |
530 | if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) | |
531 | tipc_bcast_disable_rcast(net); | |
532 | ||
52666986 | 533 | return true; |
d999297c JPM |
534 | } |
535 | ||
6ab30f9c JPM |
536 | /** |
537 | * tipc_link_fsm_evt - link finite state machine | |
538 | * @l: pointer to link | |
539 | * @evt: state machine event to be processed | |
6ab30f9c | 540 | */ |
662921cd | 541 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 542 | { |
5045f7b9 | 543 | int rc = 0; |
6ab30f9c JPM |
544 | |
545 | switch (l->state) { | |
662921cd | 546 | case LINK_RESETTING: |
6ab30f9c | 547 | switch (evt) { |
662921cd JPM |
548 | case LINK_PEER_RESET_EVT: |
549 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 550 | break; |
662921cd JPM |
551 | case LINK_RESET_EVT: |
552 | l->state = LINK_RESET; | |
553 | break; | |
554 | case LINK_FAILURE_EVT: | |
555 | case LINK_FAILOVER_BEGIN_EVT: | |
556 | case LINK_ESTABLISH_EVT: | |
557 | case LINK_FAILOVER_END_EVT: | |
558 | case LINK_SYNCH_BEGIN_EVT: | |
559 | case LINK_SYNCH_END_EVT: | |
560 | default: | |
561 | goto illegal_evt; | |
562 | } | |
563 | break; | |
564 | case LINK_RESET: | |
565 | switch (evt) { | |
566 | case LINK_PEER_RESET_EVT: | |
567 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 568 | break; |
662921cd JPM |
569 | case LINK_FAILOVER_BEGIN_EVT: |
570 | l->state = LINK_FAILINGOVER; | |
571 | case LINK_FAILURE_EVT: | |
572 | case LINK_RESET_EVT: | |
573 | case LINK_ESTABLISH_EVT: | |
574 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 575 | break; |
662921cd JPM |
576 | case LINK_SYNCH_BEGIN_EVT: |
577 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 578 | default: |
662921cd | 579 | goto illegal_evt; |
6ab30f9c JPM |
580 | } |
581 | break; | |
662921cd | 582 | case LINK_PEER_RESET: |
6ab30f9c | 583 | switch (evt) { |
662921cd JPM |
584 | case LINK_RESET_EVT: |
585 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 586 | break; |
662921cd JPM |
587 | case LINK_PEER_RESET_EVT: |
588 | case LINK_ESTABLISH_EVT: | |
589 | case LINK_FAILURE_EVT: | |
6ab30f9c | 590 | break; |
662921cd JPM |
591 | case LINK_SYNCH_BEGIN_EVT: |
592 | case LINK_SYNCH_END_EVT: | |
593 | case LINK_FAILOVER_BEGIN_EVT: | |
594 | case LINK_FAILOVER_END_EVT: | |
595 | default: | |
596 | goto illegal_evt; | |
597 | } | |
598 | break; | |
599 | case LINK_FAILINGOVER: | |
600 | switch (evt) { | |
601 | case LINK_FAILOVER_END_EVT: | |
602 | l->state = LINK_RESET; | |
6ab30f9c | 603 | break; |
662921cd JPM |
604 | case LINK_PEER_RESET_EVT: |
605 | case LINK_RESET_EVT: | |
606 | case LINK_ESTABLISH_EVT: | |
607 | case LINK_FAILURE_EVT: | |
608 | break; | |
609 | case LINK_FAILOVER_BEGIN_EVT: | |
610 | case LINK_SYNCH_BEGIN_EVT: | |
611 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 612 | default: |
662921cd | 613 | goto illegal_evt; |
6ab30f9c JPM |
614 | } |
615 | break; | |
662921cd | 616 | case LINK_ESTABLISHING: |
6ab30f9c | 617 | switch (evt) { |
662921cd JPM |
618 | case LINK_ESTABLISH_EVT: |
619 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 620 | break; |
662921cd JPM |
621 | case LINK_FAILOVER_BEGIN_EVT: |
622 | l->state = LINK_FAILINGOVER; | |
623 | break; | |
662921cd | 624 | case LINK_RESET_EVT: |
73f646ce JPM |
625 | l->state = LINK_RESET; |
626 | break; | |
662921cd | 627 | case LINK_FAILURE_EVT: |
73f646ce | 628 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
629 | case LINK_SYNCH_BEGIN_EVT: |
630 | case LINK_FAILOVER_END_EVT: | |
631 | break; | |
632 | case LINK_SYNCH_END_EVT: | |
633 | default: | |
634 | goto illegal_evt; | |
635 | } | |
636 | break; | |
637 | case LINK_ESTABLISHED: | |
638 | switch (evt) { | |
639 | case LINK_PEER_RESET_EVT: | |
640 | l->state = LINK_PEER_RESET; | |
641 | rc |= TIPC_LINK_DOWN_EVT; | |
642 | break; | |
643 | case LINK_FAILURE_EVT: | |
644 | l->state = LINK_RESETTING; | |
645 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 646 | break; |
662921cd JPM |
647 | case LINK_RESET_EVT: |
648 | l->state = LINK_RESET; | |
6ab30f9c | 649 | break; |
662921cd | 650 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 651 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 652 | break; |
662921cd JPM |
653 | case LINK_SYNCH_BEGIN_EVT: |
654 | l->state = LINK_SYNCHING; | |
655 | break; | |
662921cd JPM |
656 | case LINK_FAILOVER_BEGIN_EVT: |
657 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 658 | default: |
662921cd | 659 | goto illegal_evt; |
6ab30f9c JPM |
660 | } |
661 | break; | |
662921cd | 662 | case LINK_SYNCHING: |
6ab30f9c | 663 | switch (evt) { |
662921cd JPM |
664 | case LINK_PEER_RESET_EVT: |
665 | l->state = LINK_PEER_RESET; | |
666 | rc |= TIPC_LINK_DOWN_EVT; | |
667 | break; | |
668 | case LINK_FAILURE_EVT: | |
669 | l->state = LINK_RESETTING; | |
670 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 671 | break; |
662921cd JPM |
672 | case LINK_RESET_EVT: |
673 | l->state = LINK_RESET; | |
6ab30f9c | 674 | break; |
662921cd JPM |
675 | case LINK_ESTABLISH_EVT: |
676 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 677 | break; |
662921cd JPM |
678 | case LINK_SYNCH_END_EVT: |
679 | l->state = LINK_ESTABLISHED; | |
680 | break; | |
681 | case LINK_FAILOVER_BEGIN_EVT: | |
682 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 683 | default: |
662921cd | 684 | goto illegal_evt; |
6ab30f9c JPM |
685 | } |
686 | break; | |
687 | default: | |
662921cd | 688 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 689 | } |
662921cd JPM |
690 | return rc; |
691 | illegal_evt: | |
692 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
693 | evt, l->state, l->name); | |
6ab30f9c JPM |
694 | return rc; |
695 | } | |
696 | ||
333ef69e JPM |
697 | /* link_profile_stats - update statistical profiling of traffic |
698 | */ | |
699 | static void link_profile_stats(struct tipc_link *l) | |
700 | { | |
701 | struct sk_buff *skb; | |
702 | struct tipc_msg *msg; | |
703 | int length; | |
704 | ||
705 | /* Update counters used in statistical profiling of send traffic */ | |
706 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
707 | l->stats.queue_sz_counts++; | |
708 | ||
709 | skb = skb_peek(&l->transmq); | |
710 | if (!skb) | |
711 | return; | |
712 | msg = buf_msg(skb); | |
713 | length = msg_size(msg); | |
714 | ||
715 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
716 | if (msg_type(msg) != FIRST_FRAGMENT) | |
717 | return; | |
718 | length = msg_size(msg_get_wrapped(msg)); | |
719 | } | |
720 | l->stats.msg_lengths_total += length; | |
721 | l->stats.msg_length_counts++; | |
722 | if (length <= 64) | |
723 | l->stats.msg_length_profile[0]++; | |
724 | else if (length <= 256) | |
725 | l->stats.msg_length_profile[1]++; | |
726 | else if (length <= 1024) | |
727 | l->stats.msg_length_profile[2]++; | |
728 | else if (length <= 4096) | |
729 | l->stats.msg_length_profile[3]++; | |
730 | else if (length <= 16384) | |
731 | l->stats.msg_length_profile[4]++; | |
732 | else if (length <= 32768) | |
733 | l->stats.msg_length_profile[5]++; | |
734 | else | |
735 | l->stats.msg_length_profile[6]++; | |
736 | } | |
737 | ||
738 | /* tipc_link_timeout - perform periodic task as instructed from node timeout | |
739 | */ | |
740 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
741 | { | |
c91522f8 YX |
742 | int mtyp = 0; |
743 | int rc = 0; | |
42b18f60 JPM |
744 | bool state = false; |
745 | bool probe = false; | |
746 | bool setup = false; | |
52666986 JPM |
747 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
748 | u16 bc_acked = l->bc_rcvlink->acked; | |
35c55c98 | 749 | struct tipc_mon_state *mstate = &l->mon_state; |
5045f7b9 | 750 | |
662921cd JPM |
751 | switch (l->state) { |
752 | case LINK_ESTABLISHED: | |
753 | case LINK_SYNCHING: | |
42b18f60 | 754 | mtyp = STATE_MSG; |
35c55c98 JPM |
755 | link_profile_stats(l); |
756 | tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); | |
757 | if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) | |
758 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
42b18f60 | 759 | state = bc_acked != bc_snt; |
35c55c98 JPM |
760 | state |= l->bc_rcvlink->rcv_unacked; |
761 | state |= l->rcv_unacked; | |
762 | state |= !skb_queue_empty(&l->transmq); | |
763 | state |= !skb_queue_empty(&l->deferdq); | |
764 | probe = mstate->probing; | |
765 | probe |= l->silent_intv_cnt; | |
766 | if (probe || mstate->monitoring) | |
767 | l->silent_intv_cnt++; | |
662921cd JPM |
768 | break; |
769 | case LINK_RESET: | |
42b18f60 JPM |
770 | setup = l->rst_cnt++ <= 4; |
771 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 772 | mtyp = RESET_MSG; |
662921cd JPM |
773 | break; |
774 | case LINK_ESTABLISHING: | |
42b18f60 | 775 | setup = true; |
5045f7b9 | 776 | mtyp = ACTIVATE_MSG; |
662921cd | 777 | break; |
662921cd | 778 | case LINK_PEER_RESET: |
598411d7 | 779 | case LINK_RESETTING: |
662921cd JPM |
780 | case LINK_FAILINGOVER: |
781 | break; | |
782 | default: | |
783 | break; | |
5045f7b9 | 784 | } |
662921cd | 785 | |
42b18f60 | 786 | if (state || probe || setup) |
8d6e79d3 | 787 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); |
5045f7b9 | 788 | |
333ef69e JPM |
789 | return rc; |
790 | } | |
791 | ||
b97bf3fd | 792 | /** |
3127a020 | 793 | * link_schedule_user - schedule a message sender for wakeup after congestion |
365ad353 JPM |
794 | * @l: congested link |
795 | * @hdr: header of message that is being sent | |
50100a5e | 796 | * Create pseudo msg to send back to user when congestion abates |
b97bf3fd | 797 | */ |
365ad353 | 798 | static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) |
b97bf3fd | 799 | { |
365ad353 JPM |
800 | u32 dnode = tipc_own_addr(l->net); |
801 | u32 dport = msg_origport(hdr); | |
3127a020 JPM |
802 | struct sk_buff *skb; |
803 | ||
3127a020 JPM |
804 | /* Create and schedule wakeup pseudo message */ |
805 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
365ad353 | 806 | dnode, l->addr, dport, 0, 0); |
3127a020 | 807 | if (!skb) |
22d85c79 | 808 | return -ENOBUFS; |
365ad353 JPM |
809 | msg_set_dest_droppable(buf_msg(skb), true); |
810 | TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); | |
811 | skb_queue_tail(&l->wakeupq, skb); | |
812 | l->stats.link_congs++; | |
3127a020 | 813 | return -ELINKCONG; |
b97bf3fd PL |
814 | } |
815 | ||
50100a5e JPM |
816 | /** |
817 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
365ad353 JPM |
818 | * @l: congested link |
819 | * Wake up a number of waiting users, as permitted by available space | |
820 | * in the send queue | |
50100a5e | 821 | */ |
1f66d161 | 822 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 823 | { |
58d78b32 | 824 | struct sk_buff *skb, *tmp; |
365ad353 | 825 | int imp, i = 0; |
50100a5e | 826 | |
1f66d161 JPM |
827 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
828 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
365ad353 JPM |
829 | if (l->backlog[imp].len < l->backlog[imp].limit) { |
830 | skb_unlink(skb, &l->wakeupq); | |
831 | skb_queue_tail(l->inputq, skb); | |
832 | } else if (i++ > 10) { | |
b97bf3fd | 833 | break; |
365ad353 | 834 | } |
b97bf3fd | 835 | } |
b97bf3fd PL |
836 | } |
837 | ||
6e498158 | 838 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 839 | { |
e74a386d JPM |
840 | l->peer_session = ANY_SESSION; |
841 | l->session++; | |
6e498158 | 842 | l->mtu = l->advertised_mtu; |
6e498158 JPM |
843 | __skb_queue_purge(&l->transmq); |
844 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 845 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 JPM |
846 | __skb_queue_purge(&l->backlogq); |
847 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
848 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
849 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
850 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
851 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
6e498158 JPM |
852 | kfree_skb(l->reasm_buf); |
853 | kfree_skb(l->failover_reasm_skb); | |
854 | l->reasm_buf = NULL; | |
855 | l->failover_reasm_skb = NULL; | |
856 | l->rcv_unacked = 0; | |
857 | l->snd_nxt = 1; | |
858 | l->rcv_nxt = 1; | |
c1ab3f1d | 859 | l->acked = 0; |
6e498158 | 860 | l->silent_intv_cnt = 0; |
88e8ac70 | 861 | l->rst_cnt = 0; |
6e498158 | 862 | l->stale_count = 0; |
52666986 | 863 | l->bc_peer_is_up = false; |
35c55c98 | 864 | memset(&l->mon_state, 0, sizeof(l->mon_state)); |
38206d59 | 865 | tipc_link_reset_stats(l); |
b97bf3fd PL |
866 | } |
867 | ||
af9b028e JPM |
868 | /** |
869 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
870 | * @link: link to use | |
871 | * @list: chain of buffers containing message | |
872 | * @xmitq: returned list of packets to be sent by caller | |
873 | * | |
365ad353 | 874 | * Consumes the buffer chain. |
af9b028e JPM |
875 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
876 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
877 | */ | |
878 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
879 | struct sk_buff_head *xmitq) | |
880 | { | |
881 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
882 | unsigned int maxwin = l->window; | |
365ad353 | 883 | int imp = msg_importance(hdr); |
af9b028e JPM |
884 | unsigned int mtu = l->mtu; |
885 | u16 ack = l->rcv_nxt - 1; | |
886 | u16 seqno = l->snd_nxt; | |
52666986 | 887 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
888 | struct sk_buff_head *transmq = &l->transmq; |
889 | struct sk_buff_head *backlogq = &l->backlogq; | |
890 | struct sk_buff *skb, *_skb, *bskb; | |
95901122 | 891 | int pkt_cnt = skb_queue_len(list); |
365ad353 | 892 | int rc = 0; |
af9b028e | 893 | |
4952cd3e RA |
894 | if (unlikely(msg_size(hdr) > mtu)) { |
895 | skb_queue_purge(list); | |
af9b028e | 896 | return -EMSGSIZE; |
4952cd3e | 897 | } |
af9b028e | 898 | |
365ad353 JPM |
899 | /* Allow oversubscription of one data msg per source at congestion */ |
900 | if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { | |
901 | if (imp == TIPC_SYSTEM_IMPORTANCE) { | |
902 | pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); | |
903 | return -ENOBUFS; | |
904 | } | |
905 | rc = link_schedule_user(l, hdr); | |
906 | } | |
907 | ||
95901122 JPM |
908 | if (pkt_cnt > 1) { |
909 | l->stats.sent_fragmented++; | |
910 | l->stats.sent_fragments += pkt_cnt; | |
911 | } | |
912 | ||
af9b028e JPM |
913 | /* Prepare each packet for sending, and add to relevant queue: */ |
914 | while (skb_queue_len(list)) { | |
915 | skb = skb_peek(list); | |
916 | hdr = buf_msg(skb); | |
917 | msg_set_seqno(hdr, seqno); | |
918 | msg_set_ack(hdr, ack); | |
52666986 | 919 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
920 | |
921 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
922 | _skb = skb_clone(skb, GFP_ATOMIC); | |
4952cd3e RA |
923 | if (!_skb) { |
924 | skb_queue_purge(list); | |
af9b028e | 925 | return -ENOBUFS; |
4952cd3e | 926 | } |
af9b028e JPM |
927 | __skb_dequeue(list); |
928 | __skb_queue_tail(transmq, skb); | |
929 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 930 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e | 931 | l->rcv_unacked = 0; |
95901122 | 932 | l->stats.sent_pkts++; |
af9b028e JPM |
933 | seqno++; |
934 | continue; | |
935 | } | |
936 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
937 | kfree_skb(__skb_dequeue(list)); | |
938 | l->stats.sent_bundled++; | |
939 | continue; | |
940 | } | |
941 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
942 | kfree_skb(__skb_dequeue(list)); | |
943 | __skb_queue_tail(backlogq, bskb); | |
944 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
945 | l->stats.sent_bundled++; | |
946 | l->stats.sent_bundles++; | |
947 | continue; | |
948 | } | |
949 | l->backlog[imp].len += skb_queue_len(list); | |
950 | skb_queue_splice_tail_init(list, backlogq); | |
951 | } | |
952 | l->snd_nxt = seqno; | |
365ad353 | 953 | return rc; |
af9b028e JPM |
954 | } |
955 | ||
d999297c JPM |
956 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
957 | { | |
958 | struct sk_buff *skb, *_skb; | |
959 | struct tipc_msg *hdr; | |
960 | u16 seqno = l->snd_nxt; | |
961 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 962 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
963 | |
964 | while (skb_queue_len(&l->transmq) < l->window) { | |
965 | skb = skb_peek(&l->backlogq); | |
966 | if (!skb) | |
967 | break; | |
968 | _skb = skb_clone(skb, GFP_ATOMIC); | |
969 | if (!_skb) | |
970 | break; | |
971 | __skb_dequeue(&l->backlogq); | |
972 | hdr = buf_msg(skb); | |
973 | l->backlog[msg_importance(hdr)].len--; | |
974 | __skb_queue_tail(&l->transmq, skb); | |
975 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 976 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 977 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
978 | msg_set_ack(hdr, ack); |
979 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c | 980 | l->rcv_unacked = 0; |
95901122 | 981 | l->stats.sent_pkts++; |
d999297c JPM |
982 | seqno++; |
983 | } | |
984 | l->snd_nxt = seqno; | |
985 | } | |
986 | ||
52666986 | 987 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 988 | { |
52666986 JPM |
989 | struct tipc_msg *hdr = buf_msg(skb); |
990 | ||
991 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
40501f90 | 992 | link_print(l, "State of link "); |
52666986 JPM |
993 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", |
994 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
995 | pr_info("sqno %u, prev: %x, src: %x\n", | |
996 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
997 | } |
998 | ||
40501f90 JPM |
999 | int tipc_link_retrans(struct tipc_link *l, struct tipc_link *nacker, |
1000 | u16 from, u16 to, struct sk_buff_head *xmitq) | |
d999297c JPM |
1001 | { |
1002 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
1003 | struct tipc_msg *hdr; | |
c1ab3f1d | 1004 | u16 ack = l->rcv_nxt - 1; |
52666986 | 1005 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
1006 | |
1007 | if (!skb) | |
1008 | return 0; | |
1009 | ||
1010 | /* Detect repeated retransmit failures on same packet */ | |
40501f90 JPM |
1011 | if (nacker->last_retransm != buf_seqno(skb)) { |
1012 | nacker->last_retransm = buf_seqno(skb); | |
1013 | nacker->stale_count = 1; | |
1014 | } else if (++nacker->stale_count > 100) { | |
d999297c | 1015 | link_retransmit_failure(l, skb); |
40501f90 JPM |
1016 | nacker->stale_count = 0; |
1017 | if (link_is_bc_sndlink(l)) | |
1018 | return TIPC_LINK_DOWN_EVT; | |
662921cd | 1019 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 1020 | } |
c1ab3f1d JPM |
1021 | |
1022 | /* Move forward to where retransmission should start */ | |
d999297c | 1023 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
1024 | if (!less(buf_seqno(skb), from)) |
1025 | break; | |
1026 | } | |
1027 | ||
1028 | skb_queue_walk_from(&l->transmq, skb) { | |
1029 | if (more(buf_seqno(skb), to)) | |
1030 | break; | |
d999297c JPM |
1031 | hdr = buf_msg(skb); |
1032 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
1033 | if (!_skb) | |
1034 | return 0; | |
1035 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
1036 | msg_set_ack(hdr, ack); |
1037 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
1038 | _skb->priority = TC_PRIO_CONTROL; |
1039 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
1040 | l->stats.retransmitted++; |
1041 | } | |
1042 | return 0; | |
1043 | } | |
1044 | ||
c637c103 | 1045 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1046 | * |
c637c103 | 1047 | * Consumes buffer if message is of right type |
7ae934be EH |
1048 | * Node lock must be held |
1049 | */ | |
52666986 | 1050 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1051 | struct sk_buff_head *inputq) |
7ae934be | 1052 | { |
399574d4 | 1053 | struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; |
a853e4c6 JPM |
1054 | struct tipc_msg *hdr = buf_msg(skb); |
1055 | ||
1056 | switch (msg_user(hdr)) { | |
c637c103 JPM |
1057 | case TIPC_LOW_IMPORTANCE: |
1058 | case TIPC_MEDIUM_IMPORTANCE: | |
1059 | case TIPC_HIGH_IMPORTANCE: | |
1060 | case TIPC_CRITICAL_IMPORTANCE: | |
2f487712 | 1061 | if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { |
399574d4 | 1062 | skb_queue_tail(mc_inputq, skb); |
a853e4c6 JPM |
1063 | return true; |
1064 | } | |
2f487712 | 1065 | case CONN_MANAGER: |
36c0a9df | 1066 | skb_queue_tail(inputq, skb); |
c637c103 | 1067 | return true; |
399574d4 JM |
1068 | case GROUP_PROTOCOL: |
1069 | skb_queue_tail(mc_inputq, skb); | |
1070 | return true; | |
7ae934be | 1071 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1072 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1073 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1074 | return true; |
1075 | case MSG_BUNDLER: | |
dff29b1a | 1076 | case TUNNEL_PROTOCOL: |
c637c103 | 1077 | case MSG_FRAGMENTER: |
7ae934be | 1078 | case BCAST_PROTOCOL: |
c637c103 | 1079 | return false; |
7ae934be | 1080 | default: |
c637c103 JPM |
1081 | pr_warn("Dropping received illegal msg type\n"); |
1082 | kfree_skb(skb); | |
1083 | return false; | |
1084 | }; | |
7ae934be | 1085 | } |
c637c103 JPM |
1086 | |
1087 | /* tipc_link_input - process packet that has passed link protocol check | |
1088 | * | |
1089 | * Consumes buffer | |
7ae934be | 1090 | */ |
9073fb8b JPM |
1091 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1092 | struct sk_buff_head *inputq) | |
7ae934be | 1093 | { |
6e498158 JPM |
1094 | struct tipc_msg *hdr = buf_msg(skb); |
1095 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1096 | struct sk_buff *iskb; |
9945e804 | 1097 | struct sk_buff_head tmpq; |
6e498158 | 1098 | int usr = msg_user(hdr); |
6144a996 | 1099 | int rc = 0; |
6e498158 JPM |
1100 | int pos = 0; |
1101 | int ipos = 0; | |
c637c103 | 1102 | |
6e498158 JPM |
1103 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1104 | if (msg_type(hdr) == SYNCH_MSG) { | |
1105 | __skb_queue_purge(&l->deferdq); | |
1106 | goto drop; | |
8b4ed863 | 1107 | } |
6e498158 JPM |
1108 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1109 | return rc; | |
1110 | kfree_skb(skb); | |
1111 | skb = iskb; | |
1112 | hdr = buf_msg(skb); | |
1113 | if (less(msg_seqno(hdr), l->drop_point)) | |
1114 | goto drop; | |
9073fb8b | 1115 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1116 | return rc; |
1117 | usr = msg_user(hdr); | |
1118 | reasm_skb = &l->failover_reasm_skb; | |
1119 | } | |
c637c103 | 1120 | |
6e498158 | 1121 | if (usr == MSG_BUNDLER) { |
9945e804 | 1122 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1123 | l->stats.recv_bundles++; |
1124 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1125 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1126 | tipc_data_input(l, iskb, &tmpq); |
1127 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1128 | return 0; |
6e498158 JPM |
1129 | } else if (usr == MSG_FRAGMENTER) { |
1130 | l->stats.recv_fragments++; | |
1131 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1132 | l->stats.recv_fragmented++; | |
9073fb8b | 1133 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1134 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1135 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1136 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1137 | } |
662921cd | 1138 | return 0; |
6e498158 | 1139 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1140 | tipc_bcast_lock(l->net); |
52666986 | 1141 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1142 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
1143 | } |
1144 | drop: | |
1145 | kfree_skb(skb); | |
662921cd | 1146 | return 0; |
7ae934be EH |
1147 | } |
1148 | ||
d999297c JPM |
1149 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1150 | { | |
1151 | bool released = false; | |
1152 | struct sk_buff *skb, *tmp; | |
1153 | ||
1154 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1155 | if (more(buf_seqno(skb), acked)) | |
1156 | break; | |
1157 | __skb_unlink(skb, &l->transmq); | |
1158 | kfree_skb(skb); | |
1159 | released = true; | |
1160 | } | |
1161 | return released; | |
1162 | } | |
1163 | ||
34b9cd64 | 1164 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1165 | * |
1166 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1167 | * risk of ack storms towards the sender | |
f9aa358a | 1168 | */ |
34b9cd64 | 1169 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1170 | { |
52666986 JPM |
1171 | if (!l) |
1172 | return 0; | |
1173 | ||
1174 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1175 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1176 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1177 | return 0; |
1178 | l->rcv_unacked = 0; | |
02d11ca2 JPM |
1179 | |
1180 | /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ | |
1181 | l->snd_nxt = l->rcv_nxt; | |
1182 | return TIPC_LINK_SND_STATE; | |
52666986 JPM |
1183 | } |
1184 | ||
1185 | /* Unicast ACK */ | |
f9aa358a JPM |
1186 | l->rcv_unacked = 0; |
1187 | l->stats.sent_acks++; | |
8d6e79d3 | 1188 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
52666986 | 1189 | return 0; |
f9aa358a JPM |
1190 | } |
1191 | ||
282b3a05 JPM |
1192 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1193 | */ | |
1194 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1195 | { | |
1196 | int mtyp = RESET_MSG; | |
634696b1 | 1197 | struct sk_buff *skb; |
282b3a05 JPM |
1198 | |
1199 | if (l->state == LINK_ESTABLISHING) | |
1200 | mtyp = ACTIVATE_MSG; | |
1201 | ||
8d6e79d3 | 1202 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); |
634696b1 JPM |
1203 | |
1204 | /* Inform peer that this endpoint is going down if applicable */ | |
1205 | skb = skb_peek_tail(xmitq); | |
1206 | if (skb && (l->state == LINK_RESET)) | |
1207 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1208 | } |
1209 | ||
f9aa358a | 1210 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
e0a05ebe JPM |
1211 | * Note that sending of broadcast NACK is coordinated among nodes, to |
1212 | * reduce the risk of NACK storms towards the sender | |
f9aa358a | 1213 | */ |
e0a05ebe JPM |
1214 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
1215 | struct sk_buff_head *xmitq) | |
f9aa358a JPM |
1216 | { |
1217 | u32 def_cnt = ++l->stats.deferred_recv; | |
e0a05ebe | 1218 | int match1, match2; |
f9aa358a | 1219 | |
e0a05ebe JPM |
1220 | if (link_is_bc_rcvlink(l)) { |
1221 | match1 = def_cnt & 0xf; | |
1222 | match2 = tipc_own_addr(l->net) & 0xf; | |
1223 | if (match1 == match2) | |
1224 | return TIPC_LINK_SND_STATE; | |
1225 | return 0; | |
1226 | } | |
52666986 | 1227 | |
f9aa358a | 1228 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
8d6e79d3 | 1229 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
e0a05ebe | 1230 | return 0; |
f9aa358a JPM |
1231 | } |
1232 | ||
d999297c | 1233 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1234 | * @l: the link that should handle the message |
d999297c JPM |
1235 | * @skb: TIPC packet |
1236 | * @xmitq: queue to place packets to be sent after this call | |
1237 | */ | |
1238 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1239 | struct sk_buff_head *xmitq) | |
1240 | { | |
f9aa358a | 1241 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1242 | struct tipc_msg *hdr; |
81204c49 | 1243 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1244 | int rc = 0; |
1245 | ||
f9aa358a | 1246 | do { |
d999297c | 1247 | hdr = buf_msg(skb); |
f9aa358a JPM |
1248 | seqno = msg_seqno(hdr); |
1249 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1250 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1251 | |
1252 | /* Verify and update link state */ | |
f9aa358a JPM |
1253 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1254 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1255 | |
662921cd | 1256 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1257 | if (l->state == LINK_ESTABLISHING) |
1258 | rc = TIPC_LINK_UP_EVT; | |
1259 | goto drop; | |
d999297c JPM |
1260 | } |
1261 | ||
f9aa358a | 1262 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1263 | l->silent_intv_cnt = 0; |
1264 | ||
81204c49 JPM |
1265 | /* Drop if outside receive window */ |
1266 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1267 | l->stats.duplicates++; | |
1268 | goto drop; | |
1269 | } | |
1270 | ||
d999297c JPM |
1271 | /* Forward queues and wake up waiting users */ |
1272 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1273 | tipc_link_advance_backlog(l, xmitq); | |
1274 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1275 | link_prepare_wakeup(l); | |
1276 | } | |
1277 | ||
81204c49 JPM |
1278 | /* Defer delivery if sequence gap */ |
1279 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1280 | __tipc_skb_queue_sorted(defq, seqno, skb); |
e0a05ebe | 1281 | rc |= tipc_link_build_nack_msg(l, xmitq); |
f9aa358a | 1282 | break; |
d999297c JPM |
1283 | } |
1284 | ||
81204c49 | 1285 | /* Deliver packet */ |
d999297c | 1286 | l->rcv_nxt++; |
95901122 | 1287 | l->stats.recv_pkts++; |
f9aa358a | 1288 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1289 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1290 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1291 | rc |= tipc_link_build_state_msg(l, xmitq); |
02d11ca2 | 1292 | if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
52666986 | 1293 | break; |
f9aa358a JPM |
1294 | } while ((skb = __skb_dequeue(defq))); |
1295 | ||
1296 | return rc; | |
1297 | drop: | |
1298 | kfree_skb(skb); | |
d999297c JPM |
1299 | return rc; |
1300 | } | |
1301 | ||
426cc2b8 | 1302 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
1303 | bool probe_reply, u16 rcvgap, |
1304 | int tolerance, int priority, | |
426cc2b8 JPM |
1305 | struct sk_buff_head *xmitq) |
1306 | { | |
02d11ca2 | 1307 | struct tipc_link *bcl = l->bc_rcvlink; |
e74a386d JPM |
1308 | struct sk_buff *skb; |
1309 | struct tipc_msg *hdr; | |
1310 | struct sk_buff_head *dfq = &l->deferdq; | |
02d11ca2 | 1311 | bool node_up = link_is_up(bcl); |
35c55c98 JPM |
1312 | struct tipc_mon_state *mstate = &l->mon_state; |
1313 | int dlen = 0; | |
1314 | void *data; | |
426cc2b8 JPM |
1315 | |
1316 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1317 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1318 | return; |
1319 | ||
e74a386d JPM |
1320 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1321 | return; | |
1322 | ||
1323 | if (!skb_queue_empty(dfq)) | |
1324 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1325 | ||
1326 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
35c55c98 | 1327 | tipc_max_domain_size, l->addr, |
e74a386d JPM |
1328 | tipc_own_addr(l->net), 0, 0, 0); |
1329 | if (!skb) | |
1330 | return; | |
1331 | ||
1332 | hdr = buf_msg(skb); | |
35c55c98 | 1333 | data = msg_data(hdr); |
e74a386d JPM |
1334 | msg_set_session(hdr, l->session); |
1335 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1336 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1337 | msg_set_next_sent(hdr, l->snd_nxt); |
1338 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
02d11ca2 | 1339 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
06bd2b1e | 1340 | msg_set_bc_ack_invalid(hdr, !node_up); |
52666986 | 1341 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
426cc2b8 JPM |
1342 | msg_set_link_tolerance(hdr, tolerance); |
1343 | msg_set_linkprio(hdr, priority); | |
1344 | msg_set_redundant_link(hdr, node_up); | |
1345 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1346 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1347 | |
1348 | if (mtyp == STATE_MSG) { | |
e74a386d | 1349 | msg_set_seq_gap(hdr, rcvgap); |
02d11ca2 | 1350 | msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); |
426cc2b8 | 1351 | msg_set_probe(hdr, probe); |
8d6e79d3 | 1352 | msg_set_is_keepalive(hdr, probe || probe_reply); |
35c55c98 JPM |
1353 | tipc_mon_prep(l->net, data, &dlen, mstate, l->bearer_id); |
1354 | msg_set_size(hdr, INT_H_SIZE + dlen); | |
1355 | skb_trim(skb, INT_H_SIZE + dlen); | |
426cc2b8 | 1356 | l->stats.sent_states++; |
52666986 | 1357 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1358 | } else { |
1359 | /* RESET_MSG or ACTIVATE_MSG */ | |
1360 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
35c55c98 JPM |
1361 | strcpy(data, l->if_name); |
1362 | msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
1363 | skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
426cc2b8 | 1364 | } |
e74a386d JPM |
1365 | if (probe) |
1366 | l->stats.sent_probes++; | |
1367 | if (rcvgap) | |
1368 | l->stats.sent_nacks++; | |
426cc2b8 | 1369 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1370 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1371 | } |
1372 | ||
6e498158 | 1373 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1374 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1375 | */ |
6e498158 JPM |
1376 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1377 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1378 | { |
6e498158 JPM |
1379 | struct sk_buff *skb, *tnlskb; |
1380 | struct tipc_msg *hdr, tnlhdr; | |
1381 | struct sk_buff_head *queue = &l->transmq; | |
1382 | struct sk_buff_head tmpxq, tnlq; | |
1383 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1384 | |
6e498158 | 1385 | if (!tnl) |
b97bf3fd PL |
1386 | return; |
1387 | ||
6e498158 JPM |
1388 | skb_queue_head_init(&tnlq); |
1389 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1390 | |
6e498158 JPM |
1391 | /* At least one packet required for safe algorithm => add dummy */ |
1392 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
e74a386d | 1393 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), |
6e498158 JPM |
1394 | 0, 0, TIPC_ERR_NO_PORT); |
1395 | if (!skb) { | |
1396 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1397 | return; |
1398 | } | |
6e498158 JPM |
1399 | skb_queue_tail(&tnlq, skb); |
1400 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1401 | __skb_queue_purge(&tmpxq); | |
1402 | ||
1403 | /* Initialize reusable tunnel packet header */ | |
e74a386d | 1404 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 JPM |
1405 | mtyp, INT_H_SIZE, l->addr); |
1406 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1407 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1408 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1409 | tnl: | |
1410 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1411 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1412 | hdr = buf_msg(skb); |
1413 | if (queue == &l->backlogq) | |
1414 | msg_set_seqno(hdr, seqno++); | |
1415 | pktlen = msg_size(hdr); | |
1416 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
57d5f64d | 1417 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC); |
6e498158 JPM |
1418 | if (!tnlskb) { |
1419 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1420 | return; |
1421 | } | |
6e498158 JPM |
1422 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1423 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1424 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1425 | } |
6e498158 JPM |
1426 | if (queue != &l->backlogq) { |
1427 | queue = &l->backlogq; | |
1428 | goto tnl; | |
f006c9c7 | 1429 | } |
1dab3d5a | 1430 | |
6e498158 | 1431 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1432 | |
6e498158 JPM |
1433 | if (mtyp == FAILOVER_MSG) { |
1434 | tnl->drop_point = l->rcv_nxt; | |
1435 | tnl->failover_reasm_skb = l->reasm_buf; | |
1436 | l->reasm_buf = NULL; | |
2da71425 | 1437 | } |
b97bf3fd PL |
1438 | } |
1439 | ||
d999297c JPM |
1440 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1441 | * Note that network plane id propagates through the network, and may | |
1442 | * change at any time. The node with lowest numerical id determines | |
1443 | * network plane | |
1444 | */ | |
1445 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1446 | struct sk_buff_head *xmitq) | |
1447 | { | |
1448 | struct tipc_msg *hdr = buf_msg(skb); | |
1449 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1450 | u16 ack = msg_ack(hdr); |
1451 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1452 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1453 | u16 peers_tol = msg_link_tolerance(hdr); | |
1454 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1455 | u16 rcv_nxt = l->rcv_nxt; |
35c55c98 | 1456 | u16 dlen = msg_data_sz(hdr); |
73f646ce | 1457 | int mtyp = msg_type(hdr); |
8d6e79d3 | 1458 | bool reply = msg_probe(hdr); |
35c55c98 | 1459 | void *data; |
d999297c JPM |
1460 | char *if_name; |
1461 | int rc = 0; | |
1462 | ||
52666986 | 1463 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1464 | goto exit; |
1465 | ||
e74a386d | 1466 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
1467 | l->net_plane = msg_net_plane(hdr); |
1468 | ||
35c55c98 JPM |
1469 | skb_linearize(skb); |
1470 | hdr = buf_msg(skb); | |
1471 | data = msg_data(hdr); | |
1472 | ||
73f646ce | 1473 | switch (mtyp) { |
d999297c JPM |
1474 | case RESET_MSG: |
1475 | ||
1476 | /* Ignore duplicate RESET with old session number */ | |
1477 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
e74a386d | 1478 | (l->peer_session != ANY_SESSION)) |
d999297c JPM |
1479 | break; |
1480 | /* fall thru' */ | |
662921cd | 1481 | |
d999297c JPM |
1482 | case ACTIVATE_MSG: |
1483 | ||
1484 | /* Complete own link name with peer's interface name */ | |
1485 | if_name = strrchr(l->name, ':') + 1; | |
1486 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1487 | break; | |
1488 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1489 | break; | |
35c55c98 | 1490 | strncpy(if_name, data, TIPC_MAX_IF_NAME); |
d999297c JPM |
1491 | |
1492 | /* Update own tolerance if peer indicates a non-zero value */ | |
1493 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1494 | l->tolerance = peers_tol; | |
1495 | ||
1496 | /* Update own priority if peer's priority is higher */ | |
1497 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1498 | l->priority = peers_prio; | |
1499 | ||
73f646ce | 1500 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
634696b1 JPM |
1501 | if (msg_peer_stopping(hdr)) |
1502 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1503 | else if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
73f646ce JPM |
1504 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
1505 | ||
1506 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1507 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1508 | rc = TIPC_LINK_UP_EVT; | |
1509 | ||
d999297c JPM |
1510 | l->peer_session = msg_session(hdr); |
1511 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1512 | if (l->mtu > msg_max_pkt(hdr)) |
1513 | l->mtu = msg_max_pkt(hdr); | |
1514 | break; | |
662921cd | 1515 | |
d999297c | 1516 | case STATE_MSG: |
662921cd | 1517 | |
d999297c JPM |
1518 | /* Update own tolerance if peer indicates a non-zero value */ |
1519 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1520 | l->tolerance = peers_tol; | |
1521 | ||
f7967556 JPM |
1522 | /* Update own prio if peer indicates a different value */ |
1523 | if ((peers_prio != l->priority) && | |
1524 | in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { | |
81729810 RA |
1525 | l->priority = peers_prio; |
1526 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1527 | } | |
1528 | ||
d999297c JPM |
1529 | l->silent_intv_cnt = 0; |
1530 | l->stats.recv_states++; | |
1531 | if (msg_probe(hdr)) | |
1532 | l->stats.recv_probes++; | |
73f646ce JPM |
1533 | |
1534 | if (!link_is_up(l)) { | |
1535 | if (l->state == LINK_ESTABLISHING) | |
1536 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1537 | break; |
73f646ce | 1538 | } |
35c55c98 JPM |
1539 | tipc_mon_rcv(l->net, data, dlen, l->addr, |
1540 | &l->mon_state, l->bearer_id); | |
d999297c | 1541 | |
662921cd | 1542 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1543 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c | 1544 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
8d6e79d3 JM |
1545 | if (rcvgap || reply) |
1546 | tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, | |
1547 | rcvgap, 0, 0, xmitq); | |
c1ab3f1d | 1548 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1549 | |
1550 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d | 1551 | if (gap) { |
40501f90 | 1552 | rc = tipc_link_retrans(l, l, ack + 1, ack + gap, xmitq); |
d999297c JPM |
1553 | l->stats.recv_nacks++; |
1554 | } | |
662921cd | 1555 | |
d999297c JPM |
1556 | tipc_link_advance_backlog(l, xmitq); |
1557 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1558 | link_prepare_wakeup(l); | |
1559 | } | |
1560 | exit: | |
1561 | kfree_skb(skb); | |
1562 | return rc; | |
1563 | } | |
1564 | ||
52666986 JPM |
1565 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1566 | */ | |
1567 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1568 | u16 peers_snd_nxt, | |
1569 | struct sk_buff_head *xmitq) | |
1570 | { | |
1571 | struct sk_buff *skb; | |
1572 | struct tipc_msg *hdr; | |
1573 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1574 | u16 ack = l->rcv_nxt - 1; | |
1575 | u16 gap_to = peers_snd_nxt - 1; | |
1576 | ||
1577 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 1578 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
1579 | if (!skb) |
1580 | return false; | |
1581 | hdr = buf_msg(skb); | |
1582 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1583 | msg_set_bcast_ack(hdr, ack); | |
1584 | msg_set_bcgap_after(hdr, ack); | |
1585 | if (dfrd_skb) | |
1586 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1587 | msg_set_bcgap_to(hdr, gap_to); | |
1588 | msg_set_non_seq(hdr, bcast); | |
1589 | __skb_queue_tail(xmitq, skb); | |
1590 | return true; | |
1591 | } | |
1592 | ||
1593 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1594 | * | |
1595 | * Give a newly added peer node the sequence number where it should | |
1596 | * start receiving and acking broadcast packets. | |
1597 | */ | |
742e0383 WF |
1598 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1599 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1600 | { |
1601 | struct sk_buff_head list; | |
1602 | ||
1603 | __skb_queue_head_init(&list); | |
1604 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1605 | return; | |
06bd2b1e | 1606 | msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); |
52666986 JPM |
1607 | tipc_link_xmit(l, &list, xmitq); |
1608 | } | |
1609 | ||
1610 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1611 | */ | |
1612 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1613 | { | |
1614 | int mtyp = msg_type(hdr); | |
1615 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1616 | ||
1617 | if (link_is_up(l)) | |
1618 | return; | |
1619 | ||
1620 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1621 | l->rcv_nxt = peers_snd_nxt; | |
1622 | l->state = LINK_ESTABLISHED; | |
1623 | return; | |
1624 | } | |
1625 | ||
1626 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1627 | return; | |
1628 | ||
1629 | if (msg_peer_node_is_up(hdr)) | |
1630 | return; | |
1631 | ||
1632 | /* Compatibility: accept older, less safe initial synch data */ | |
1633 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1634 | l->rcv_nxt = peers_snd_nxt; | |
1635 | } | |
1636 | ||
7c4a54b9 JPM |
1637 | /* link_bc_retr eval()- check if the indicated range can be retransmitted now |
1638 | * - Adjust permitted range if there is overlap with previous retransmission | |
1639 | */ | |
1640 | static bool link_bc_retr_eval(struct tipc_link *l, u16 *from, u16 *to) | |
1641 | { | |
1642 | unsigned long elapsed = jiffies_to_msecs(jiffies - l->prev_retr); | |
1643 | ||
1644 | if (less(*to, *from)) | |
1645 | return false; | |
1646 | ||
1647 | /* New retransmission request */ | |
1648 | if ((elapsed > TIPC_BC_RETR_LIMIT) || | |
1649 | less(*to, l->prev_from) || more(*from, l->prev_to)) { | |
1650 | l->prev_from = *from; | |
1651 | l->prev_to = *to; | |
1652 | l->prev_retr = jiffies; | |
1653 | return true; | |
1654 | } | |
1655 | ||
1656 | /* Inside range of previous retransmit */ | |
1657 | if (!less(*from, l->prev_from) && !more(*to, l->prev_to)) | |
1658 | return false; | |
1659 | ||
1660 | /* Fully or partially outside previous range => exclude overlap */ | |
1661 | if (less(*from, l->prev_from)) { | |
1662 | *to = l->prev_from - 1; | |
1663 | l->prev_from = *from; | |
1664 | } | |
1665 | if (more(*to, l->prev_to)) { | |
1666 | *from = l->prev_to + 1; | |
1667 | l->prev_to = *to; | |
1668 | } | |
1669 | l->prev_retr = jiffies; | |
1670 | return true; | |
1671 | } | |
1672 | ||
52666986 JPM |
1673 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state |
1674 | */ | |
02d11ca2 JPM |
1675 | int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
1676 | struct sk_buff_head *xmitq) | |
52666986 | 1677 | { |
7c4a54b9 | 1678 | struct tipc_link *snd_l = l->bc_sndlink; |
52666986 | 1679 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
02d11ca2 JPM |
1680 | u16 from = msg_bcast_ack(hdr) + 1; |
1681 | u16 to = from + msg_bc_gap(hdr) - 1; | |
1682 | int rc = 0; | |
52666986 JPM |
1683 | |
1684 | if (!link_is_up(l)) | |
02d11ca2 | 1685 | return rc; |
52666986 JPM |
1686 | |
1687 | if (!msg_peer_node_is_up(hdr)) | |
02d11ca2 | 1688 | return rc; |
52666986 | 1689 | |
2d18ac4b JPM |
1690 | /* Open when peer ackowledges our bcast init msg (pkt #1) */ |
1691 | if (msg_ack(hdr)) | |
1692 | l->bc_peer_is_up = true; | |
1693 | ||
1694 | if (!l->bc_peer_is_up) | |
02d11ca2 | 1695 | return rc; |
52666986 | 1696 | |
7c4a54b9 JPM |
1697 | l->stats.recv_nacks++; |
1698 | ||
52666986 JPM |
1699 | /* Ignore if peers_snd_nxt goes beyond receive window */ |
1700 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
02d11ca2 JPM |
1701 | return rc; |
1702 | ||
7c4a54b9 | 1703 | if (link_bc_retr_eval(snd_l, &from, &to)) |
40501f90 | 1704 | rc = tipc_link_retrans(snd_l, l, from, to, xmitq); |
02d11ca2 JPM |
1705 | |
1706 | l->snd_nxt = peers_snd_nxt; | |
1707 | if (link_bc_rcv_gap(l)) | |
1708 | rc |= TIPC_LINK_SND_STATE; | |
1709 | ||
1710 | /* Return now if sender supports nack via STATE messages */ | |
1711 | if (l->peer_caps & TIPC_BCAST_STATE_NACK) | |
1712 | return rc; | |
1713 | ||
1714 | /* Otherwise, be backwards compatible */ | |
52666986 JPM |
1715 | |
1716 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1717 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
02d11ca2 | 1718 | return 0; |
52666986 JPM |
1719 | } |
1720 | ||
1721 | /* Don't NACK if one was recently sent or peeked */ | |
1722 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1723 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
02d11ca2 | 1724 | return 0; |
52666986 JPM |
1725 | } |
1726 | ||
1727 | /* Conditionally delay NACK sending until next synch rcv */ | |
1728 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1729 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1730 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
02d11ca2 | 1731 | return 0; |
52666986 JPM |
1732 | } |
1733 | ||
1734 | /* Send NACK now but suppress next one */ | |
1735 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1736 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
02d11ca2 | 1737 | return 0; |
52666986 JPM |
1738 | } |
1739 | ||
1740 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1741 | struct sk_buff_head *xmitq) | |
1742 | { | |
1743 | struct sk_buff *skb, *tmp; | |
1744 | struct tipc_link *snd_l = l->bc_sndlink; | |
1745 | ||
1746 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1747 | return; | |
1748 | ||
1749 | if (!more(acked, l->acked)) | |
1750 | return; | |
1751 | ||
1752 | /* Skip over packets peer has already acked */ | |
1753 | skb_queue_walk(&snd_l->transmq, skb) { | |
1754 | if (more(buf_seqno(skb), l->acked)) | |
1755 | break; | |
1756 | } | |
1757 | ||
1758 | /* Update/release the packets peer is acking now */ | |
1759 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1760 | if (more(buf_seqno(skb), acked)) | |
1761 | break; | |
1762 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1763 | __skb_unlink(skb, &snd_l->transmq); | |
1764 | kfree_skb(skb); | |
1765 | } | |
1766 | } | |
1767 | l->acked = acked; | |
1768 | tipc_link_advance_backlog(snd_l, xmitq); | |
1769 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1770 | link_prepare_wakeup(snd_l); | |
1771 | } | |
1772 | ||
1773 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
02d11ca2 JPM |
1774 | * This function is here for backwards compatibility, since |
1775 | * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. | |
52666986 JPM |
1776 | */ |
1777 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1778 | struct sk_buff_head *xmitq) | |
1779 | { | |
1780 | struct tipc_msg *hdr = buf_msg(skb); | |
1781 | u32 dnode = msg_destnode(hdr); | |
1782 | int mtyp = msg_type(hdr); | |
1783 | u16 acked = msg_bcast_ack(hdr); | |
1784 | u16 from = acked + 1; | |
1785 | u16 to = msg_bcgap_to(hdr); | |
1786 | u16 peers_snd_nxt = to + 1; | |
1787 | int rc = 0; | |
1788 | ||
1789 | kfree_skb(skb); | |
1790 | ||
1791 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1792 | return 0; | |
1793 | ||
1794 | if (mtyp != STATE_MSG) | |
1795 | return 0; | |
1796 | ||
e74a386d | 1797 | if (dnode == tipc_own_addr(l->net)) { |
52666986 | 1798 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
40501f90 | 1799 | rc = tipc_link_retrans(l->bc_sndlink, l, from, to, xmitq); |
52666986 JPM |
1800 | l->stats.recv_nacks++; |
1801 | return rc; | |
1802 | } | |
1803 | ||
1804 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1805 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1806 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1807 | ||
1808 | return 0; | |
1809 | } | |
1810 | ||
e3eea1eb | 1811 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1812 | { |
218527fe | 1813 | int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1814 | |
1815 | l->window = win; | |
5a0950c2 JPM |
1816 | l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win); |
1817 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2); | |
1818 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3); | |
1819 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4); | |
1f66d161 | 1820 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
b97bf3fd PL |
1821 | } |
1822 | ||
b97bf3fd | 1823 | /** |
38206d59 | 1824 | * link_reset_stats - reset link statistics |
1a90632d | 1825 | * @l: pointer to link |
b97bf3fd | 1826 | */ |
38206d59 | 1827 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 1828 | { |
38206d59 | 1829 | memset(&l->stats, 0, sizeof(l->stats)); |
b97bf3fd PL |
1830 | } |
1831 | ||
1a20cc25 | 1832 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1833 | { |
1a20cc25 | 1834 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1835 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1836 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1837 | |
662921cd | 1838 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1839 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1840 | skb_queue_len(&l->transmq), head, tail, | |
1841 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1842 | } |
0655f6a8 RA |
1843 | |
1844 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1845 | */ | |
1846 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1847 | { | |
1848 | int err; | |
1849 | ||
1850 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
fceb6435 | 1851 | tipc_nl_prop_policy, NULL); |
0655f6a8 RA |
1852 | if (err) |
1853 | return err; | |
1854 | ||
1855 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1856 | u32 prio; | |
1857 | ||
1858 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1859 | if (prio > TIPC_MAX_LINK_PRI) | |
1860 | return -EINVAL; | |
1861 | } | |
1862 | ||
1863 | if (props[TIPC_NLA_PROP_TOL]) { | |
1864 | u32 tol; | |
1865 | ||
1866 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1867 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1868 | return -EINVAL; | |
1869 | } | |
1870 | ||
1871 | if (props[TIPC_NLA_PROP_WIN]) { | |
1872 | u32 win; | |
1873 | ||
1874 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1875 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1876 | return -EINVAL; | |
1877 | } | |
1878 | ||
1879 | return 0; | |
1880 | } | |
7be57fc6 | 1881 | |
d8182804 | 1882 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
1883 | { |
1884 | int i; | |
1885 | struct nlattr *stats; | |
1886 | ||
1887 | struct nla_map { | |
1888 | u32 key; | |
1889 | u32 val; | |
1890 | }; | |
1891 | ||
1892 | struct nla_map map[] = { | |
95901122 | 1893 | {TIPC_NLA_STATS_RX_INFO, 0}, |
7be57fc6 RA |
1894 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
1895 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1896 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1897 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
95901122 | 1898 | {TIPC_NLA_STATS_TX_INFO, 0}, |
7be57fc6 RA |
1899 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
1900 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1901 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1902 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1903 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1904 | s->msg_length_counts : 1}, | |
1905 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1906 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1907 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1908 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1909 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1910 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1911 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1912 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1913 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1914 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1915 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1916 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1917 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1918 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1919 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1920 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1921 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1922 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1923 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1924 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1925 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1926 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1927 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1928 | }; | |
1929 | ||
1930 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1931 | if (!stats) | |
1932 | return -EMSGSIZE; | |
1933 | ||
1934 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1935 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1936 | goto msg_full; | |
1937 | ||
1938 | nla_nest_end(skb, stats); | |
1939 | ||
1940 | return 0; | |
1941 | msg_full: | |
1942 | nla_nest_cancel(skb, stats); | |
1943 | ||
1944 | return -EMSGSIZE; | |
1945 | } | |
1946 | ||
1947 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
1948 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
1949 | struct tipc_link *link, int nlflags) | |
7be57fc6 | 1950 | { |
23fd3eac | 1951 | u32 self = tipc_own_addr(net); |
7be57fc6 RA |
1952 | struct nlattr *attrs; |
1953 | struct nlattr *prop; | |
23fd3eac JM |
1954 | void *hdr; |
1955 | int err; | |
7be57fc6 | 1956 | |
bfb3e5dd | 1957 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1958 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1959 | if (!hdr) |
1960 | return -EMSGSIZE; | |
1961 | ||
1962 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1963 | if (!attrs) | |
1964 | goto msg_full; | |
1965 | ||
1966 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1967 | goto attr_msg_full; | |
23fd3eac | 1968 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self))) |
7be57fc6 | 1969 | goto attr_msg_full; |
ed193ece | 1970 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1971 | goto attr_msg_full; |
95901122 | 1972 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) |
7be57fc6 | 1973 | goto attr_msg_full; |
95901122 | 1974 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) |
7be57fc6 RA |
1975 | goto attr_msg_full; |
1976 | ||
1977 | if (tipc_link_is_up(link)) | |
1978 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1979 | goto attr_msg_full; | |
c72fa872 | 1980 | if (link->active) |
7be57fc6 RA |
1981 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
1982 | goto attr_msg_full; | |
1983 | ||
1984 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1985 | if (!prop) | |
1986 | goto attr_msg_full; | |
1987 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1988 | goto prop_msg_full; | |
1989 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1990 | goto prop_msg_full; | |
1991 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1992 | link->window)) |
7be57fc6 RA |
1993 | goto prop_msg_full; |
1994 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1995 | goto prop_msg_full; | |
1996 | nla_nest_end(msg->skb, prop); | |
1997 | ||
1998 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1999 | if (err) | |
2000 | goto attr_msg_full; | |
2001 | ||
2002 | nla_nest_end(msg->skb, attrs); | |
2003 | genlmsg_end(msg->skb, hdr); | |
2004 | ||
2005 | return 0; | |
2006 | ||
2007 | prop_msg_full: | |
2008 | nla_nest_cancel(msg->skb, prop); | |
2009 | attr_msg_full: | |
2010 | nla_nest_cancel(msg->skb, attrs); | |
2011 | msg_full: | |
2012 | genlmsg_cancel(msg->skb, hdr); | |
2013 | ||
2014 | return -EMSGSIZE; | |
2015 | } | |
38206d59 JPM |
2016 | |
2017 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
2018 | struct tipc_stats *stats) | |
2019 | { | |
2020 | int i; | |
2021 | struct nlattr *nest; | |
2022 | ||
2023 | struct nla_map { | |
2024 | __u32 key; | |
2025 | __u32 val; | |
2026 | }; | |
2027 | ||
2028 | struct nla_map map[] = { | |
95901122 | 2029 | {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, |
38206d59 JPM |
2030 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
2031 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
2032 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
2033 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
95901122 | 2034 | {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, |
38206d59 JPM |
2035 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
2036 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
2037 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
2038 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
2039 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
2040 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
2041 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
2042 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
2043 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
2044 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
2045 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
2046 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
2047 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
2048 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
2049 | }; | |
2050 | ||
2051 | nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2052 | if (!nest) | |
2053 | return -EMSGSIZE; | |
2054 | ||
2055 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2056 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2057 | goto msg_full; | |
2058 | ||
2059 | nla_nest_end(skb, nest); | |
2060 | ||
2061 | return 0; | |
2062 | msg_full: | |
2063 | nla_nest_cancel(skb, nest); | |
2064 | ||
2065 | return -EMSGSIZE; | |
2066 | } | |
2067 | ||
2068 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
2069 | { | |
2070 | int err; | |
2071 | void *hdr; | |
2072 | struct nlattr *attrs; | |
2073 | struct nlattr *prop; | |
2074 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
2075 | struct tipc_link *bcl = tn->bcl; | |
2076 | ||
2077 | if (!bcl) | |
2078 | return 0; | |
2079 | ||
2080 | tipc_bcast_lock(net); | |
2081 | ||
2082 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2083 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
2084 | if (!hdr) { |
2085 | tipc_bcast_unlock(net); | |
38206d59 | 2086 | return -EMSGSIZE; |
b53ce3e7 | 2087 | } |
38206d59 JPM |
2088 | |
2089 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2090 | if (!attrs) | |
2091 | goto msg_full; | |
2092 | ||
2093 | /* The broadcast link is always up */ | |
2094 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2095 | goto attr_msg_full; | |
2096 | ||
2097 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
2098 | goto attr_msg_full; | |
2099 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
2100 | goto attr_msg_full; | |
95901122 | 2101 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) |
38206d59 | 2102 | goto attr_msg_full; |
95901122 | 2103 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) |
38206d59 JPM |
2104 | goto attr_msg_full; |
2105 | ||
2106 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2107 | if (!prop) | |
2108 | goto attr_msg_full; | |
2109 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
2110 | goto prop_msg_full; | |
2111 | nla_nest_end(msg->skb, prop); | |
2112 | ||
2113 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2114 | if (err) | |
2115 | goto attr_msg_full; | |
2116 | ||
2117 | tipc_bcast_unlock(net); | |
2118 | nla_nest_end(msg->skb, attrs); | |
2119 | genlmsg_end(msg->skb, hdr); | |
2120 | ||
2121 | return 0; | |
2122 | ||
2123 | prop_msg_full: | |
2124 | nla_nest_cancel(msg->skb, prop); | |
2125 | attr_msg_full: | |
2126 | nla_nest_cancel(msg->skb, attrs); | |
2127 | msg_full: | |
2128 | tipc_bcast_unlock(net); | |
2129 | genlmsg_cancel(msg->skb, hdr); | |
2130 | ||
2131 | return -EMSGSIZE; | |
2132 | } | |
2133 | ||
d01332f1 RA |
2134 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
2135 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2136 | { |
2137 | l->tolerance = tol; | |
37c64cf6 JM |
2138 | if (link_is_up(l)) |
2139 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); | |
38206d59 JPM |
2140 | } |
2141 | ||
d01332f1 RA |
2142 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2143 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2144 | { |
2145 | l->priority = prio; | |
8d6e79d3 | 2146 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2147 | } |
2148 | ||
2149 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2150 | { | |
2151 | l->abort_limit = limit; | |
2152 | } |