Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
c1336ee4 | 4 | * Copyright (c) 1996-2007, 2012-2015, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
38206d59 JPM |
48 | struct tipc_stats { |
49 | u32 sent_info; /* used in counting # sent packets */ | |
50 | u32 recv_info; /* used in counting # recv'd packets */ | |
51 | u32 sent_states; | |
52 | u32 recv_states; | |
53 | u32 sent_probes; | |
54 | u32 recv_probes; | |
55 | u32 sent_nacks; | |
56 | u32 recv_nacks; | |
57 | u32 sent_acks; | |
58 | u32 sent_bundled; | |
59 | u32 sent_bundles; | |
60 | u32 recv_bundled; | |
61 | u32 recv_bundles; | |
62 | u32 retransmitted; | |
63 | u32 sent_fragmented; | |
64 | u32 sent_fragments; | |
65 | u32 recv_fragmented; | |
66 | u32 recv_fragments; | |
67 | u32 link_congs; /* # port sends blocked by congestion */ | |
68 | u32 deferred_recv; | |
69 | u32 duplicates; | |
70 | u32 max_queue_sz; /* send queue size high water mark */ | |
71 | u32 accu_queue_sz; /* used for send queue size profiling */ | |
72 | u32 queue_sz_counts; /* used for send queue size profiling */ | |
73 | u32 msg_length_counts; /* used for message length profiling */ | |
74 | u32 msg_lengths_total; /* used for message length profiling */ | |
75 | u32 msg_length_profile[7]; /* used for msg. length profiling */ | |
76 | }; | |
77 | ||
78 | /** | |
79 | * struct tipc_link - TIPC link data structure | |
80 | * @addr: network address of link's peer node | |
81 | * @name: link name character string | |
82 | * @media_addr: media address to use when sending messages over link | |
83 | * @timer: link timer | |
84 | * @net: pointer to namespace struct | |
85 | * @refcnt: reference counter for permanent references (owner node & timer) | |
86 | * @peer_session: link session # being used by peer end of link | |
87 | * @peer_bearer_id: bearer id used by link's peer endpoint | |
88 | * @bearer_id: local bearer id used by link | |
89 | * @tolerance: minimum link continuity loss needed to reset link [in ms] | |
90 | * @keepalive_intv: link keepalive timer interval | |
91 | * @abort_limit: # of unacknowledged continuity probes needed to reset link | |
92 | * @state: current state of link FSM | |
93 | * @peer_caps: bitmap describing capabilities of peer node | |
94 | * @silent_intv_cnt: # of timer intervals without any reception from peer | |
95 | * @proto_msg: template for control messages generated by link | |
96 | * @pmsg: convenience pointer to "proto_msg" field | |
97 | * @priority: current link priority | |
98 | * @net_plane: current link network plane ('A' through 'H') | |
99 | * @backlog_limit: backlog queue congestion thresholds (indexed by importance) | |
100 | * @exp_msg_count: # of tunnelled messages expected during link changeover | |
101 | * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset | |
102 | * @mtu: current maximum packet size for this link | |
103 | * @advertised_mtu: advertised own mtu when link is being established | |
104 | * @transmitq: queue for sent, non-acked messages | |
105 | * @backlogq: queue for messages waiting to be sent | |
106 | * @snt_nxt: next sequence number to use for outbound messages | |
107 | * @last_retransmitted: sequence number of most recently retransmitted message | |
108 | * @stale_count: # of identical retransmit requests made by peer | |
109 | * @ackers: # of peers that needs to ack each packet before it can be released | |
110 | * @acked: # last packet acked by a certain peer. Used for broadcast. | |
111 | * @rcv_nxt: next sequence number to expect for inbound messages | |
112 | * @deferred_queue: deferred queue saved OOS b'cast message received from node | |
113 | * @unacked_window: # of inbound messages rx'd without ack'ing back to peer | |
114 | * @inputq: buffer queue for messages to be delivered upwards | |
115 | * @namedq: buffer queue for name table messages to be delivered upwards | |
116 | * @next_out: ptr to first unsent outbound message in queue | |
117 | * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate | |
118 | * @long_msg_seq_no: next identifier to use for outbound fragmented messages | |
119 | * @reasm_buf: head of partially reassembled inbound message fragments | |
120 | * @bc_rcvr: marks that this is a broadcast receiver link | |
121 | * @stats: collects statistics regarding link activity | |
122 | */ | |
123 | struct tipc_link { | |
124 | u32 addr; | |
125 | char name[TIPC_MAX_LINK_NAME]; | |
126 | struct tipc_media_addr *media_addr; | |
127 | struct net *net; | |
128 | ||
129 | /* Management and link supervision data */ | |
130 | u32 peer_session; | |
131 | u32 peer_bearer_id; | |
132 | u32 bearer_id; | |
133 | u32 tolerance; | |
134 | unsigned long keepalive_intv; | |
135 | u32 abort_limit; | |
136 | u32 state; | |
137 | u16 peer_caps; | |
138 | bool active; | |
139 | u32 silent_intv_cnt; | |
140 | struct { | |
141 | unchar hdr[INT_H_SIZE]; | |
142 | unchar body[TIPC_MAX_IF_NAME]; | |
143 | } proto_msg; | |
144 | struct tipc_msg *pmsg; | |
145 | u32 priority; | |
146 | char net_plane; | |
147 | ||
148 | /* Failover/synch */ | |
149 | u16 drop_point; | |
150 | struct sk_buff *failover_reasm_skb; | |
151 | ||
152 | /* Max packet negotiation */ | |
153 | u16 mtu; | |
154 | u16 advertised_mtu; | |
155 | ||
156 | /* Sending */ | |
157 | struct sk_buff_head transmq; | |
158 | struct sk_buff_head backlogq; | |
159 | struct { | |
160 | u16 len; | |
161 | u16 limit; | |
162 | } backlog[5]; | |
163 | u16 snd_nxt; | |
164 | u16 last_retransm; | |
165 | u16 window; | |
166 | u32 stale_count; | |
167 | ||
168 | /* Reception */ | |
169 | u16 rcv_nxt; | |
170 | u32 rcv_unacked; | |
171 | struct sk_buff_head deferdq; | |
172 | struct sk_buff_head *inputq; | |
173 | struct sk_buff_head *namedq; | |
174 | ||
175 | /* Congestion handling */ | |
176 | struct sk_buff_head wakeupq; | |
177 | ||
178 | /* Fragmentation/reassembly */ | |
179 | struct sk_buff *reasm_buf; | |
180 | ||
181 | /* Broadcast */ | |
182 | u16 ackers; | |
183 | u16 acked; | |
184 | struct tipc_link *bc_rcvlink; | |
185 | struct tipc_link *bc_sndlink; | |
186 | int nack_state; | |
187 | bool bc_peer_is_up; | |
188 | ||
189 | /* Statistics */ | |
190 | struct tipc_stats stats; | |
191 | }; | |
192 | ||
2cf8aa19 EH |
193 | /* |
194 | * Error message prefixes | |
195 | */ | |
6e498158 | 196 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 197 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 198 | |
0655f6a8 RA |
199 | /* Properties valid for media, bearar and link */ |
200 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { | |
201 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, | |
202 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, | |
203 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, | |
204 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } | |
205 | }; | |
206 | ||
52666986 JPM |
207 | /* Send states for broadcast NACKs |
208 | */ | |
209 | enum { | |
210 | BC_NACK_SND_CONDITIONAL, | |
211 | BC_NACK_SND_UNCONDITIONAL, | |
212 | BC_NACK_SND_SUPPRESS, | |
213 | }; | |
214 | ||
d999297c JPM |
215 | /* |
216 | * Interval between NACKs when packets arrive out of order | |
217 | */ | |
218 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
a686e685 AS |
219 | /* |
220 | * Out-of-range value for link session numbers | |
221 | */ | |
d3504c34 | 222 | #define WILDCARD_SESSION 0x10000 |
a686e685 | 223 | |
662921cd | 224 | /* Link FSM states: |
b97bf3fd | 225 | */ |
d3504c34 | 226 | enum { |
662921cd JPM |
227 | LINK_ESTABLISHED = 0xe, |
228 | LINK_ESTABLISHING = 0xe << 4, | |
229 | LINK_RESET = 0x1 << 8, | |
230 | LINK_RESETTING = 0x2 << 12, | |
231 | LINK_PEER_RESET = 0xd << 16, | |
232 | LINK_FAILINGOVER = 0xf << 20, | |
233 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
234 | }; |
235 | ||
236 | /* Link FSM state checking routines | |
237 | */ | |
662921cd | 238 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 239 | { |
662921cd | 240 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 241 | } |
b97bf3fd | 242 | |
d999297c JPM |
243 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
244 | struct sk_buff_head *xmitq); | |
426cc2b8 JPM |
245 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
246 | u16 rcvgap, int tolerance, int priority, | |
247 | struct sk_buff_head *xmitq); | |
1a90632d | 248 | static void link_print(struct tipc_link *l, const char *str); |
52666986 JPM |
249 | static void tipc_link_build_nack_msg(struct tipc_link *l, |
250 | struct sk_buff_head *xmitq); | |
251 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, | |
252 | struct sk_buff_head *xmitq); | |
253 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
8b4ed863 | 254 | |
b97bf3fd | 255 | /* |
05790c64 | 256 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 257 | */ |
662921cd | 258 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 259 | { |
662921cd JPM |
260 | return link_is_up(l); |
261 | } | |
262 | ||
c8199300 JPM |
263 | bool tipc_link_peer_is_down(struct tipc_link *l) |
264 | { | |
265 | return l->state == LINK_PEER_RESET; | |
266 | } | |
267 | ||
662921cd JPM |
268 | bool tipc_link_is_reset(struct tipc_link *l) |
269 | { | |
270 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
271 | } | |
272 | ||
73f646ce JPM |
273 | bool tipc_link_is_establishing(struct tipc_link *l) |
274 | { | |
275 | return l->state == LINK_ESTABLISHING; | |
276 | } | |
277 | ||
662921cd JPM |
278 | bool tipc_link_is_synching(struct tipc_link *l) |
279 | { | |
280 | return l->state == LINK_SYNCHING; | |
281 | } | |
282 | ||
283 | bool tipc_link_is_failingover(struct tipc_link *l) | |
284 | { | |
285 | return l->state == LINK_FAILINGOVER; | |
286 | } | |
287 | ||
288 | bool tipc_link_is_blocked(struct tipc_link *l) | |
289 | { | |
290 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
291 | } |
292 | ||
742e0383 | 293 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
294 | { |
295 | return !l->bc_sndlink; | |
296 | } | |
297 | ||
742e0383 | 298 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
299 | { |
300 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
301 | } | |
302 | ||
9d13ec65 | 303 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 304 | { |
c72fa872 JPM |
305 | return l->active; |
306 | } | |
9d13ec65 | 307 | |
c72fa872 JPM |
308 | void tipc_link_set_active(struct tipc_link *l, bool active) |
309 | { | |
310 | l->active = active; | |
b97bf3fd PL |
311 | } |
312 | ||
38206d59 JPM |
313 | u32 tipc_link_id(struct tipc_link *l) |
314 | { | |
315 | return l->peer_bearer_id << 16 | l->bearer_id; | |
316 | } | |
317 | ||
318 | int tipc_link_window(struct tipc_link *l) | |
319 | { | |
320 | return l->window; | |
321 | } | |
322 | ||
323 | int tipc_link_prio(struct tipc_link *l) | |
324 | { | |
325 | return l->priority; | |
326 | } | |
327 | ||
328 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
329 | { | |
330 | return l->tolerance; | |
331 | } | |
332 | ||
333 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
334 | { | |
335 | return l->inputq; | |
336 | } | |
337 | ||
338 | char tipc_link_plane(struct tipc_link *l) | |
339 | { | |
340 | return l->net_plane; | |
341 | } | |
342 | ||
52666986 JPM |
343 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
344 | struct tipc_link *uc_l, | |
345 | struct sk_buff_head *xmitq) | |
2f566124 | 346 | { |
52666986 JPM |
347 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
348 | ||
349 | snd_l->ackers++; | |
350 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 351 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 352 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
353 | } |
354 | ||
52666986 JPM |
355 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
356 | struct tipc_link *rcv_l, | |
357 | struct sk_buff_head *xmitq) | |
2f566124 | 358 | { |
52666986 JPM |
359 | u16 ack = snd_l->snd_nxt - 1; |
360 | ||
361 | snd_l->ackers--; | |
362 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); | |
363 | tipc_link_reset(rcv_l); | |
364 | rcv_l->state = LINK_RESET; | |
365 | if (!snd_l->ackers) { | |
366 | tipc_link_reset(snd_l); | |
9a650838 | 367 | snd_l->state = LINK_RESET; |
52666986 JPM |
368 | __skb_queue_purge(xmitq); |
369 | } | |
2f566124 JPM |
370 | } |
371 | ||
372 | int tipc_link_bc_peers(struct tipc_link *l) | |
373 | { | |
374 | return l->ackers; | |
375 | } | |
376 | ||
959e1781 JPM |
377 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
378 | { | |
379 | l->mtu = mtu; | |
380 | } | |
381 | ||
382 | int tipc_link_mtu(struct tipc_link *l) | |
383 | { | |
384 | return l->mtu; | |
385 | } | |
386 | ||
38206d59 JPM |
387 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
388 | { | |
389 | return l->rcv_nxt; | |
390 | } | |
391 | ||
392 | u16 tipc_link_acked(struct tipc_link *l) | |
393 | { | |
394 | return l->acked; | |
395 | } | |
396 | ||
397 | char *tipc_link_name(struct tipc_link *l) | |
398 | { | |
399 | return l->name; | |
400 | } | |
401 | ||
440d8963 JPM |
402 | static u32 link_own_addr(struct tipc_link *l) |
403 | { | |
404 | return msg_prevnode(l->pmsg); | |
405 | } | |
406 | ||
38206d59 JPM |
407 | void tipc_link_reinit(struct tipc_link *l, u32 addr) |
408 | { | |
409 | msg_set_prevnode(l->pmsg, addr); | |
410 | } | |
411 | ||
b97bf3fd | 412 | /** |
4323add6 | 413 | * tipc_link_create - create a new link |
440d8963 | 414 | * @n: pointer to associated node |
0e05498e JPM |
415 | * @if_name: associated interface name |
416 | * @bearer_id: id (index) of associated bearer | |
417 | * @tolerance: link tolerance to be used by link | |
418 | * @net_plane: network plane (A,B,c..) this link belongs to | |
419 | * @mtu: mtu to be advertised by link | |
420 | * @priority: priority to be used by link | |
421 | * @window: send window to be used by link | |
422 | * @session: session to be used by link | |
440d8963 | 423 | * @ownnode: identity of own node |
0e05498e | 424 | * @peer: node id of peer node |
fd556f20 | 425 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
426 | * @bc_sndlink: the namespace global link used for broadcast sending |
427 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
428 | * @inputq: queue to put messages ready for delivery |
429 | * @namedq: queue to put binding table update messages ready for delivery | |
430 | * @link: return value, pointer to put the created link | |
c4307285 | 431 | * |
440d8963 | 432 | * Returns true if link was created, otherwise false |
b97bf3fd | 433 | */ |
c72fa872 | 434 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e JPM |
435 | int tolerance, char net_plane, u32 mtu, int priority, |
436 | int window, u32 session, u32 ownnode, u32 peer, | |
52666986 | 437 | u16 peer_caps, |
52666986 JPM |
438 | struct tipc_link *bc_sndlink, |
439 | struct tipc_link *bc_rcvlink, | |
440 | struct sk_buff_head *inputq, | |
441 | struct sk_buff_head *namedq, | |
440d8963 | 442 | struct tipc_link **link) |
b97bf3fd | 443 | { |
440d8963 JPM |
444 | struct tipc_link *l; |
445 | struct tipc_msg *hdr; | |
37b9c08a | 446 | |
440d8963 JPM |
447 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
448 | if (!l) | |
449 | return false; | |
450 | *link = l; | |
0e05498e JPM |
451 | l->pmsg = (struct tipc_msg *)&l->proto_msg; |
452 | hdr = l->pmsg; | |
453 | tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer); | |
454 | msg_set_size(hdr, sizeof(l->proto_msg)); | |
455 | msg_set_session(hdr, session); | |
456 | msg_set_bearer_id(hdr, l->bearer_id); | |
37b9c08a | 457 | |
440d8963 | 458 | /* Note: peer i/f name is completed by reset/activate message */ |
440d8963 JPM |
459 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
460 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
461 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
0e05498e | 462 | strcpy((char *)msg_data(hdr), if_name); |
b97bf3fd | 463 | |
440d8963 | 464 | l->addr = peer; |
fd556f20 | 465 | l->peer_caps = peer_caps; |
c72fa872 | 466 | l->net = net; |
440d8963 | 467 | l->peer_session = WILDCARD_SESSION; |
0e05498e JPM |
468 | l->bearer_id = bearer_id; |
469 | l->tolerance = tolerance; | |
470 | l->net_plane = net_plane; | |
471 | l->advertised_mtu = mtu; | |
472 | l->mtu = mtu; | |
473 | l->priority = priority; | |
474 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 475 | l->ackers = 1; |
52666986 JPM |
476 | l->bc_sndlink = bc_sndlink; |
477 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
478 | l->inputq = inputq; |
479 | l->namedq = namedq; | |
480 | l->state = LINK_RESETTING; | |
440d8963 JPM |
481 | __skb_queue_head_init(&l->transmq); |
482 | __skb_queue_head_init(&l->backlogq); | |
483 | __skb_queue_head_init(&l->deferdq); | |
484 | skb_queue_head_init(&l->wakeupq); | |
485 | skb_queue_head_init(l->inputq); | |
486 | return true; | |
b97bf3fd PL |
487 | } |
488 | ||
32301906 JPM |
489 | /** |
490 | * tipc_link_bc_create - create new link to be used for broadcast | |
491 | * @n: pointer to associated node | |
492 | * @mtu: mtu to be used | |
493 | * @window: send window to be used | |
494 | * @inputq: queue to put messages ready for delivery | |
495 | * @namedq: queue to put binding table update messages ready for delivery | |
496 | * @link: return value, pointer to put the created link | |
497 | * | |
498 | * Returns true if link was created, otherwise false | |
499 | */ | |
c72fa872 | 500 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 501 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
502 | struct sk_buff_head *inputq, |
503 | struct sk_buff_head *namedq, | |
52666986 | 504 | struct tipc_link *bc_sndlink, |
32301906 JPM |
505 | struct tipc_link **link) |
506 | { | |
507 | struct tipc_link *l; | |
508 | ||
c72fa872 | 509 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
2af5ae37 | 510 | 0, ownnode, peer, peer_caps, bc_sndlink, |
52666986 | 511 | NULL, inputq, namedq, link)) |
32301906 JPM |
512 | return false; |
513 | ||
514 | l = *link; | |
515 | strcpy(l->name, tipc_bclink_name); | |
516 | tipc_link_reset(l); | |
52666986 | 517 | l->state = LINK_RESET; |
2f566124 | 518 | l->ackers = 0; |
52666986 | 519 | l->bc_rcvlink = l; |
32301906 | 520 | |
52666986 JPM |
521 | /* Broadcast send link is always up */ |
522 | if (link_is_bc_sndlink(l)) | |
523 | l->state = LINK_ESTABLISHED; | |
d999297c | 524 | |
52666986 | 525 | return true; |
d999297c JPM |
526 | } |
527 | ||
6ab30f9c JPM |
528 | /** |
529 | * tipc_link_fsm_evt - link finite state machine | |
530 | * @l: pointer to link | |
531 | * @evt: state machine event to be processed | |
6ab30f9c | 532 | */ |
662921cd | 533 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 534 | { |
5045f7b9 | 535 | int rc = 0; |
6ab30f9c JPM |
536 | |
537 | switch (l->state) { | |
662921cd | 538 | case LINK_RESETTING: |
6ab30f9c | 539 | switch (evt) { |
662921cd JPM |
540 | case LINK_PEER_RESET_EVT: |
541 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 542 | break; |
662921cd JPM |
543 | case LINK_RESET_EVT: |
544 | l->state = LINK_RESET; | |
545 | break; | |
546 | case LINK_FAILURE_EVT: | |
547 | case LINK_FAILOVER_BEGIN_EVT: | |
548 | case LINK_ESTABLISH_EVT: | |
549 | case LINK_FAILOVER_END_EVT: | |
550 | case LINK_SYNCH_BEGIN_EVT: | |
551 | case LINK_SYNCH_END_EVT: | |
552 | default: | |
553 | goto illegal_evt; | |
554 | } | |
555 | break; | |
556 | case LINK_RESET: | |
557 | switch (evt) { | |
558 | case LINK_PEER_RESET_EVT: | |
559 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 560 | break; |
662921cd JPM |
561 | case LINK_FAILOVER_BEGIN_EVT: |
562 | l->state = LINK_FAILINGOVER; | |
563 | case LINK_FAILURE_EVT: | |
564 | case LINK_RESET_EVT: | |
565 | case LINK_ESTABLISH_EVT: | |
566 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 567 | break; |
662921cd JPM |
568 | case LINK_SYNCH_BEGIN_EVT: |
569 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 570 | default: |
662921cd | 571 | goto illegal_evt; |
6ab30f9c JPM |
572 | } |
573 | break; | |
662921cd | 574 | case LINK_PEER_RESET: |
6ab30f9c | 575 | switch (evt) { |
662921cd JPM |
576 | case LINK_RESET_EVT: |
577 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 578 | break; |
662921cd JPM |
579 | case LINK_PEER_RESET_EVT: |
580 | case LINK_ESTABLISH_EVT: | |
581 | case LINK_FAILURE_EVT: | |
6ab30f9c | 582 | break; |
662921cd JPM |
583 | case LINK_SYNCH_BEGIN_EVT: |
584 | case LINK_SYNCH_END_EVT: | |
585 | case LINK_FAILOVER_BEGIN_EVT: | |
586 | case LINK_FAILOVER_END_EVT: | |
587 | default: | |
588 | goto illegal_evt; | |
589 | } | |
590 | break; | |
591 | case LINK_FAILINGOVER: | |
592 | switch (evt) { | |
593 | case LINK_FAILOVER_END_EVT: | |
594 | l->state = LINK_RESET; | |
6ab30f9c | 595 | break; |
662921cd JPM |
596 | case LINK_PEER_RESET_EVT: |
597 | case LINK_RESET_EVT: | |
598 | case LINK_ESTABLISH_EVT: | |
599 | case LINK_FAILURE_EVT: | |
600 | break; | |
601 | case LINK_FAILOVER_BEGIN_EVT: | |
602 | case LINK_SYNCH_BEGIN_EVT: | |
603 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 604 | default: |
662921cd | 605 | goto illegal_evt; |
6ab30f9c JPM |
606 | } |
607 | break; | |
662921cd | 608 | case LINK_ESTABLISHING: |
6ab30f9c | 609 | switch (evt) { |
662921cd JPM |
610 | case LINK_ESTABLISH_EVT: |
611 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 612 | break; |
662921cd JPM |
613 | case LINK_FAILOVER_BEGIN_EVT: |
614 | l->state = LINK_FAILINGOVER; | |
615 | break; | |
662921cd | 616 | case LINK_RESET_EVT: |
73f646ce JPM |
617 | l->state = LINK_RESET; |
618 | break; | |
662921cd | 619 | case LINK_FAILURE_EVT: |
73f646ce | 620 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
621 | case LINK_SYNCH_BEGIN_EVT: |
622 | case LINK_FAILOVER_END_EVT: | |
623 | break; | |
624 | case LINK_SYNCH_END_EVT: | |
625 | default: | |
626 | goto illegal_evt; | |
627 | } | |
628 | break; | |
629 | case LINK_ESTABLISHED: | |
630 | switch (evt) { | |
631 | case LINK_PEER_RESET_EVT: | |
632 | l->state = LINK_PEER_RESET; | |
633 | rc |= TIPC_LINK_DOWN_EVT; | |
634 | break; | |
635 | case LINK_FAILURE_EVT: | |
636 | l->state = LINK_RESETTING; | |
637 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 638 | break; |
662921cd JPM |
639 | case LINK_RESET_EVT: |
640 | l->state = LINK_RESET; | |
6ab30f9c | 641 | break; |
662921cd | 642 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 643 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 644 | break; |
662921cd JPM |
645 | case LINK_SYNCH_BEGIN_EVT: |
646 | l->state = LINK_SYNCHING; | |
647 | break; | |
662921cd JPM |
648 | case LINK_FAILOVER_BEGIN_EVT: |
649 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 650 | default: |
662921cd | 651 | goto illegal_evt; |
6ab30f9c JPM |
652 | } |
653 | break; | |
662921cd | 654 | case LINK_SYNCHING: |
6ab30f9c | 655 | switch (evt) { |
662921cd JPM |
656 | case LINK_PEER_RESET_EVT: |
657 | l->state = LINK_PEER_RESET; | |
658 | rc |= TIPC_LINK_DOWN_EVT; | |
659 | break; | |
660 | case LINK_FAILURE_EVT: | |
661 | l->state = LINK_RESETTING; | |
662 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 663 | break; |
662921cd JPM |
664 | case LINK_RESET_EVT: |
665 | l->state = LINK_RESET; | |
6ab30f9c | 666 | break; |
662921cd JPM |
667 | case LINK_ESTABLISH_EVT: |
668 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 669 | break; |
662921cd JPM |
670 | case LINK_SYNCH_END_EVT: |
671 | l->state = LINK_ESTABLISHED; | |
672 | break; | |
673 | case LINK_FAILOVER_BEGIN_EVT: | |
674 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 675 | default: |
662921cd | 676 | goto illegal_evt; |
6ab30f9c JPM |
677 | } |
678 | break; | |
679 | default: | |
662921cd | 680 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 681 | } |
662921cd JPM |
682 | return rc; |
683 | illegal_evt: | |
684 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
685 | evt, l->state, l->name); | |
6ab30f9c JPM |
686 | return rc; |
687 | } | |
688 | ||
333ef69e JPM |
689 | /* link_profile_stats - update statistical profiling of traffic |
690 | */ | |
691 | static void link_profile_stats(struct tipc_link *l) | |
692 | { | |
693 | struct sk_buff *skb; | |
694 | struct tipc_msg *msg; | |
695 | int length; | |
696 | ||
697 | /* Update counters used in statistical profiling of send traffic */ | |
698 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
699 | l->stats.queue_sz_counts++; | |
700 | ||
701 | skb = skb_peek(&l->transmq); | |
702 | if (!skb) | |
703 | return; | |
704 | msg = buf_msg(skb); | |
705 | length = msg_size(msg); | |
706 | ||
707 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
708 | if (msg_type(msg) != FIRST_FRAGMENT) | |
709 | return; | |
710 | length = msg_size(msg_get_wrapped(msg)); | |
711 | } | |
712 | l->stats.msg_lengths_total += length; | |
713 | l->stats.msg_length_counts++; | |
714 | if (length <= 64) | |
715 | l->stats.msg_length_profile[0]++; | |
716 | else if (length <= 256) | |
717 | l->stats.msg_length_profile[1]++; | |
718 | else if (length <= 1024) | |
719 | l->stats.msg_length_profile[2]++; | |
720 | else if (length <= 4096) | |
721 | l->stats.msg_length_profile[3]++; | |
722 | else if (length <= 16384) | |
723 | l->stats.msg_length_profile[4]++; | |
724 | else if (length <= 32768) | |
725 | l->stats.msg_length_profile[5]++; | |
726 | else | |
727 | l->stats.msg_length_profile[6]++; | |
728 | } | |
729 | ||
52666986 JPM |
730 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
731 | */ | |
333ef69e JPM |
732 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
733 | */ | |
734 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
735 | { | |
736 | int rc = 0; | |
5045f7b9 JPM |
737 | int mtyp = STATE_MSG; |
738 | bool xmit = false; | |
739 | bool prb = false; | |
52666986 JPM |
740 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
741 | u16 bc_acked = l->bc_rcvlink->acked; | |
742 | bool bc_up = link_is_up(l->bc_rcvlink); | |
333ef69e JPM |
743 | |
744 | link_profile_stats(l); | |
5045f7b9 | 745 | |
662921cd JPM |
746 | switch (l->state) { |
747 | case LINK_ESTABLISHED: | |
748 | case LINK_SYNCHING: | |
5045f7b9 | 749 | if (!l->silent_intv_cnt) { |
52666986 | 750 | if (bc_up && (bc_acked != bc_snt)) |
5045f7b9 JPM |
751 | xmit = true; |
752 | } else if (l->silent_intv_cnt <= l->abort_limit) { | |
753 | xmit = true; | |
754 | prb = true; | |
755 | } else { | |
662921cd | 756 | rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
5045f7b9 JPM |
757 | } |
758 | l->silent_intv_cnt++; | |
662921cd JPM |
759 | break; |
760 | case LINK_RESET: | |
5045f7b9 JPM |
761 | xmit = true; |
762 | mtyp = RESET_MSG; | |
662921cd JPM |
763 | break; |
764 | case LINK_ESTABLISHING: | |
5045f7b9 JPM |
765 | xmit = true; |
766 | mtyp = ACTIVATE_MSG; | |
662921cd | 767 | break; |
662921cd | 768 | case LINK_PEER_RESET: |
598411d7 | 769 | case LINK_RESETTING: |
662921cd JPM |
770 | case LINK_FAILINGOVER: |
771 | break; | |
772 | default: | |
773 | break; | |
5045f7b9 | 774 | } |
662921cd | 775 | |
5045f7b9 JPM |
776 | if (xmit) |
777 | tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); | |
778 | ||
333ef69e JPM |
779 | return rc; |
780 | } | |
781 | ||
b97bf3fd | 782 | /** |
3127a020 | 783 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 784 | * @link: congested link |
3127a020 | 785 | * @list: message that was attempted sent |
50100a5e | 786 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 787 | * Does not consume buffer list |
b97bf3fd | 788 | */ |
3127a020 | 789 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 790 | { |
3127a020 JPM |
791 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
792 | int imp = msg_importance(msg); | |
793 | u32 oport = msg_origport(msg); | |
794 | u32 addr = link_own_addr(link); | |
795 | struct sk_buff *skb; | |
796 | ||
797 | /* This really cannot happen... */ | |
798 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
799 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 800 | return -ENOBUFS; |
3127a020 JPM |
801 | } |
802 | /* Non-blocking sender: */ | |
803 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
804 | return -ELINKCONG; | |
805 | ||
806 | /* Create and schedule wakeup pseudo message */ | |
807 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
808 | addr, addr, oport, 0, 0); | |
809 | if (!skb) | |
22d85c79 | 810 | return -ENOBUFS; |
3127a020 JPM |
811 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
812 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
813 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 814 | link->stats.link_congs++; |
3127a020 | 815 | return -ELINKCONG; |
b97bf3fd PL |
816 | } |
817 | ||
50100a5e JPM |
818 | /** |
819 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
820 | * @link: congested link | |
821 | * Move a number of waiting users, as permitted by available space in | |
822 | * the send queue, from link wait queue to node wait queue for wakeup | |
823 | */ | |
1f66d161 | 824 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 825 | { |
1f66d161 JPM |
826 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
827 | int imp, lim; | |
58d78b32 | 828 | struct sk_buff *skb, *tmp; |
50100a5e | 829 | |
1f66d161 JPM |
830 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
831 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
832 | lim = l->window + l->backlog[imp].limit; | |
833 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
834 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 835 | break; |
1f66d161 | 836 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 837 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 838 | } |
b97bf3fd PL |
839 | } |
840 | ||
6e498158 | 841 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 842 | { |
a686e685 | 843 | /* Link is down, accept any session */ |
6e498158 | 844 | l->peer_session = WILDCARD_SESSION; |
b97bf3fd | 845 | |
6e498158 JPM |
846 | /* If peer is up, it only accepts an incremented session number */ |
847 | msg_set_session(l->pmsg, msg_session(l->pmsg) + 1); | |
b97bf3fd | 848 | |
6e498158 JPM |
849 | /* Prepare for renewed mtu size negotiation */ |
850 | l->mtu = l->advertised_mtu; | |
b97bf3fd | 851 | |
2af5ae37 | 852 | /* Clean up all queues and counters: */ |
6e498158 JPM |
853 | __skb_queue_purge(&l->transmq); |
854 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 855 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 JPM |
856 | __skb_queue_purge(&l->backlogq); |
857 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
858 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
859 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
860 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
861 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
6e498158 JPM |
862 | kfree_skb(l->reasm_buf); |
863 | kfree_skb(l->failover_reasm_skb); | |
864 | l->reasm_buf = NULL; | |
865 | l->failover_reasm_skb = NULL; | |
866 | l->rcv_unacked = 0; | |
867 | l->snd_nxt = 1; | |
868 | l->rcv_nxt = 1; | |
c1ab3f1d | 869 | l->acked = 0; |
6e498158 JPM |
870 | l->silent_intv_cnt = 0; |
871 | l->stats.recv_info = 0; | |
872 | l->stale_count = 0; | |
52666986 | 873 | l->bc_peer_is_up = false; |
38206d59 | 874 | tipc_link_reset_stats(l); |
b97bf3fd PL |
875 | } |
876 | ||
af9b028e JPM |
877 | /** |
878 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
879 | * @link: link to use | |
880 | * @list: chain of buffers containing message | |
881 | * @xmitq: returned list of packets to be sent by caller | |
882 | * | |
883 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
884 | * since the caller then may want to make more send attempts. | |
885 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
886 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
887 | */ | |
888 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
889 | struct sk_buff_head *xmitq) | |
890 | { | |
891 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
892 | unsigned int maxwin = l->window; | |
893 | unsigned int i, imp = msg_importance(hdr); | |
894 | unsigned int mtu = l->mtu; | |
895 | u16 ack = l->rcv_nxt - 1; | |
896 | u16 seqno = l->snd_nxt; | |
52666986 | 897 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
898 | struct sk_buff_head *transmq = &l->transmq; |
899 | struct sk_buff_head *backlogq = &l->backlogq; | |
900 | struct sk_buff *skb, *_skb, *bskb; | |
901 | ||
902 | /* Match msg importance against this and all higher backlog limits: */ | |
903 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
904 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
905 | return link_schedule_user(l, list); | |
906 | } | |
907 | if (unlikely(msg_size(hdr) > mtu)) | |
908 | return -EMSGSIZE; | |
909 | ||
910 | /* Prepare each packet for sending, and add to relevant queue: */ | |
911 | while (skb_queue_len(list)) { | |
912 | skb = skb_peek(list); | |
913 | hdr = buf_msg(skb); | |
914 | msg_set_seqno(hdr, seqno); | |
915 | msg_set_ack(hdr, ack); | |
52666986 | 916 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
917 | |
918 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
919 | _skb = skb_clone(skb, GFP_ATOMIC); | |
920 | if (!_skb) | |
921 | return -ENOBUFS; | |
922 | __skb_dequeue(list); | |
923 | __skb_queue_tail(transmq, skb); | |
924 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 925 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e JPM |
926 | l->rcv_unacked = 0; |
927 | seqno++; | |
928 | continue; | |
929 | } | |
930 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
931 | kfree_skb(__skb_dequeue(list)); | |
932 | l->stats.sent_bundled++; | |
933 | continue; | |
934 | } | |
935 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
936 | kfree_skb(__skb_dequeue(list)); | |
937 | __skb_queue_tail(backlogq, bskb); | |
938 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
939 | l->stats.sent_bundled++; | |
940 | l->stats.sent_bundles++; | |
941 | continue; | |
942 | } | |
943 | l->backlog[imp].len += skb_queue_len(list); | |
944 | skb_queue_splice_tail_init(list, backlogq); | |
945 | } | |
946 | l->snd_nxt = seqno; | |
947 | return 0; | |
948 | } | |
949 | ||
d999297c JPM |
950 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
951 | { | |
952 | struct sk_buff *skb, *_skb; | |
953 | struct tipc_msg *hdr; | |
954 | u16 seqno = l->snd_nxt; | |
955 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 956 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
957 | |
958 | while (skb_queue_len(&l->transmq) < l->window) { | |
959 | skb = skb_peek(&l->backlogq); | |
960 | if (!skb) | |
961 | break; | |
962 | _skb = skb_clone(skb, GFP_ATOMIC); | |
963 | if (!_skb) | |
964 | break; | |
965 | __skb_dequeue(&l->backlogq); | |
966 | hdr = buf_msg(skb); | |
967 | l->backlog[msg_importance(hdr)].len--; | |
968 | __skb_queue_tail(&l->transmq, skb); | |
969 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 970 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 971 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
972 | msg_set_ack(hdr, ack); |
973 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
974 | l->rcv_unacked = 0; |
975 | seqno++; | |
976 | } | |
977 | l->snd_nxt = seqno; | |
978 | } | |
979 | ||
52666986 | 980 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 981 | { |
52666986 JPM |
982 | struct tipc_msg *hdr = buf_msg(skb); |
983 | ||
984 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
985 | link_print(l, "Resetting link "); | |
986 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
987 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
988 | pr_info("sqno %u, prev: %x, src: %x\n", | |
989 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
990 | } |
991 | ||
c1ab3f1d JPM |
992 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
993 | struct sk_buff_head *xmitq) | |
d999297c JPM |
994 | { |
995 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
996 | struct tipc_msg *hdr; | |
c1ab3f1d | 997 | u16 ack = l->rcv_nxt - 1; |
52666986 | 998 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
999 | |
1000 | if (!skb) | |
1001 | return 0; | |
1002 | ||
1003 | /* Detect repeated retransmit failures on same packet */ | |
1004 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
1005 | l->last_retransm = buf_seqno(skb); | |
1006 | l->stale_count = 1; | |
1007 | } else if (++l->stale_count > 100) { | |
1008 | link_retransmit_failure(l, skb); | |
662921cd | 1009 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 1010 | } |
c1ab3f1d JPM |
1011 | |
1012 | /* Move forward to where retransmission should start */ | |
d999297c | 1013 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
1014 | if (!less(buf_seqno(skb), from)) |
1015 | break; | |
1016 | } | |
1017 | ||
1018 | skb_queue_walk_from(&l->transmq, skb) { | |
1019 | if (more(buf_seqno(skb), to)) | |
1020 | break; | |
d999297c JPM |
1021 | hdr = buf_msg(skb); |
1022 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
1023 | if (!_skb) | |
1024 | return 0; | |
1025 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
1026 | msg_set_ack(hdr, ack); |
1027 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
1028 | _skb->priority = TC_PRIO_CONTROL; |
1029 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
1030 | l->stats.retransmitted++; |
1031 | } | |
1032 | return 0; | |
1033 | } | |
1034 | ||
c637c103 | 1035 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1036 | * |
c637c103 | 1037 | * Consumes buffer if message is of right type |
7ae934be EH |
1038 | * Node lock must be held |
1039 | */ | |
52666986 | 1040 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1041 | struct sk_buff_head *inputq) |
7ae934be | 1042 | { |
9073fb8b | 1043 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
1044 | case TIPC_LOW_IMPORTANCE: |
1045 | case TIPC_MEDIUM_IMPORTANCE: | |
1046 | case TIPC_HIGH_IMPORTANCE: | |
1047 | case TIPC_CRITICAL_IMPORTANCE: | |
1048 | case CONN_MANAGER: | |
9945e804 | 1049 | skb_queue_tail(inputq, skb); |
c637c103 | 1050 | return true; |
7ae934be | 1051 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1052 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1053 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1054 | return true; |
1055 | case MSG_BUNDLER: | |
dff29b1a | 1056 | case TUNNEL_PROTOCOL: |
c637c103 | 1057 | case MSG_FRAGMENTER: |
7ae934be | 1058 | case BCAST_PROTOCOL: |
c637c103 | 1059 | return false; |
7ae934be | 1060 | default: |
c637c103 JPM |
1061 | pr_warn("Dropping received illegal msg type\n"); |
1062 | kfree_skb(skb); | |
1063 | return false; | |
1064 | }; | |
7ae934be | 1065 | } |
c637c103 JPM |
1066 | |
1067 | /* tipc_link_input - process packet that has passed link protocol check | |
1068 | * | |
1069 | * Consumes buffer | |
7ae934be | 1070 | */ |
9073fb8b JPM |
1071 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1072 | struct sk_buff_head *inputq) | |
7ae934be | 1073 | { |
6e498158 JPM |
1074 | struct tipc_msg *hdr = buf_msg(skb); |
1075 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1076 | struct sk_buff *iskb; |
9945e804 | 1077 | struct sk_buff_head tmpq; |
6e498158 | 1078 | int usr = msg_user(hdr); |
6144a996 | 1079 | int rc = 0; |
6e498158 JPM |
1080 | int pos = 0; |
1081 | int ipos = 0; | |
c637c103 | 1082 | |
6e498158 JPM |
1083 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1084 | if (msg_type(hdr) == SYNCH_MSG) { | |
1085 | __skb_queue_purge(&l->deferdq); | |
1086 | goto drop; | |
8b4ed863 | 1087 | } |
6e498158 JPM |
1088 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1089 | return rc; | |
1090 | kfree_skb(skb); | |
1091 | skb = iskb; | |
1092 | hdr = buf_msg(skb); | |
1093 | if (less(msg_seqno(hdr), l->drop_point)) | |
1094 | goto drop; | |
9073fb8b | 1095 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1096 | return rc; |
1097 | usr = msg_user(hdr); | |
1098 | reasm_skb = &l->failover_reasm_skb; | |
1099 | } | |
c637c103 | 1100 | |
6e498158 | 1101 | if (usr == MSG_BUNDLER) { |
9945e804 | 1102 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1103 | l->stats.recv_bundles++; |
1104 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1105 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1106 | tipc_data_input(l, iskb, &tmpq); |
1107 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1108 | return 0; |
6e498158 JPM |
1109 | } else if (usr == MSG_FRAGMENTER) { |
1110 | l->stats.recv_fragments++; | |
1111 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1112 | l->stats.recv_fragmented++; | |
9073fb8b | 1113 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1114 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1115 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1116 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1117 | } |
662921cd | 1118 | return 0; |
6e498158 | 1119 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1120 | tipc_bcast_lock(l->net); |
52666986 | 1121 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1122 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
1123 | } |
1124 | drop: | |
1125 | kfree_skb(skb); | |
662921cd | 1126 | return 0; |
7ae934be EH |
1127 | } |
1128 | ||
d999297c JPM |
1129 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1130 | { | |
1131 | bool released = false; | |
1132 | struct sk_buff *skb, *tmp; | |
1133 | ||
1134 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1135 | if (more(buf_seqno(skb), acked)) | |
1136 | break; | |
1137 | __skb_unlink(skb, &l->transmq); | |
1138 | kfree_skb(skb); | |
1139 | released = true; | |
1140 | } | |
1141 | return released; | |
1142 | } | |
1143 | ||
f9aa358a | 1144 | /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission |
52666986 JPM |
1145 | * |
1146 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1147 | * risk of ack storms towards the sender | |
f9aa358a | 1148 | */ |
52666986 | 1149 | int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1150 | { |
52666986 JPM |
1151 | if (!l) |
1152 | return 0; | |
1153 | ||
1154 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1155 | if (link_is_bc_rcvlink(l)) { | |
1156 | if (((l->rcv_nxt ^ link_own_addr(l)) & 0xf) != 0xf) | |
1157 | return 0; | |
1158 | l->rcv_unacked = 0; | |
1159 | return TIPC_LINK_SND_BC_ACK; | |
1160 | } | |
1161 | ||
1162 | /* Unicast ACK */ | |
f9aa358a JPM |
1163 | l->rcv_unacked = 0; |
1164 | l->stats.sent_acks++; | |
1165 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
52666986 | 1166 | return 0; |
f9aa358a JPM |
1167 | } |
1168 | ||
282b3a05 JPM |
1169 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1170 | */ | |
1171 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1172 | { | |
1173 | int mtyp = RESET_MSG; | |
1174 | ||
1175 | if (l->state == LINK_ESTABLISHING) | |
1176 | mtyp = ACTIVATE_MSG; | |
1177 | ||
1178 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); | |
1179 | } | |
1180 | ||
f9aa358a JPM |
1181 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
1182 | */ | |
1183 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
1184 | struct sk_buff_head *xmitq) | |
1185 | { | |
1186 | u32 def_cnt = ++l->stats.deferred_recv; | |
1187 | ||
52666986 JPM |
1188 | if (link_is_bc_rcvlink(l)) |
1189 | return; | |
1190 | ||
f9aa358a JPM |
1191 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
1192 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1193 | } | |
1194 | ||
d999297c | 1195 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1196 | * @l: the link that should handle the message |
d999297c JPM |
1197 | * @skb: TIPC packet |
1198 | * @xmitq: queue to place packets to be sent after this call | |
1199 | */ | |
1200 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1201 | struct sk_buff_head *xmitq) | |
1202 | { | |
f9aa358a | 1203 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1204 | struct tipc_msg *hdr; |
81204c49 | 1205 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1206 | int rc = 0; |
1207 | ||
f9aa358a | 1208 | do { |
d999297c | 1209 | hdr = buf_msg(skb); |
f9aa358a JPM |
1210 | seqno = msg_seqno(hdr); |
1211 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1212 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1213 | |
1214 | /* Verify and update link state */ | |
f9aa358a JPM |
1215 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1216 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1217 | |
662921cd | 1218 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1219 | if (l->state == LINK_ESTABLISHING) |
1220 | rc = TIPC_LINK_UP_EVT; | |
1221 | goto drop; | |
d999297c JPM |
1222 | } |
1223 | ||
f9aa358a | 1224 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1225 | l->silent_intv_cnt = 0; |
1226 | ||
81204c49 JPM |
1227 | /* Drop if outside receive window */ |
1228 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1229 | l->stats.duplicates++; | |
1230 | goto drop; | |
1231 | } | |
1232 | ||
d999297c JPM |
1233 | /* Forward queues and wake up waiting users */ |
1234 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1235 | tipc_link_advance_backlog(l, xmitq); | |
1236 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1237 | link_prepare_wakeup(l); | |
1238 | } | |
1239 | ||
81204c49 JPM |
1240 | /* Defer delivery if sequence gap */ |
1241 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1242 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1243 | tipc_link_build_nack_msg(l, xmitq); |
1244 | break; | |
d999297c JPM |
1245 | } |
1246 | ||
81204c49 | 1247 | /* Deliver packet */ |
d999297c JPM |
1248 | l->rcv_nxt++; |
1249 | l->stats.recv_info++; | |
f9aa358a | 1250 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1251 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1252 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
52666986 JPM |
1253 | rc |= tipc_link_build_ack_msg(l, xmitq); |
1254 | if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK)) | |
1255 | break; | |
f9aa358a JPM |
1256 | } while ((skb = __skb_dequeue(defq))); |
1257 | ||
1258 | return rc; | |
1259 | drop: | |
1260 | kfree_skb(skb); | |
d999297c JPM |
1261 | return rc; |
1262 | } | |
1263 | ||
b97bf3fd PL |
1264 | /* |
1265 | * Send protocol message to the other endpoint. | |
1266 | */ | |
38206d59 JPM |
1267 | static void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, |
1268 | int probe_msg, u32 gap, u32 tolerance, | |
1269 | u32 priority) | |
b97bf3fd | 1270 | { |
426cc2b8 JPM |
1271 | struct sk_buff *skb = NULL; |
1272 | struct sk_buff_head xmitq; | |
b97bf3fd | 1273 | |
426cc2b8 JPM |
1274 | __skb_queue_head_init(&xmitq); |
1275 | tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap, | |
1276 | tolerance, priority, &xmitq); | |
1277 | skb = __skb_dequeue(&xmitq); | |
1278 | if (!skb) | |
b97bf3fd | 1279 | return; |
c72fa872 | 1280 | tipc_bearer_xmit_skb(l->net, l->bearer_id, skb, l->media_addr); |
426cc2b8 | 1281 | l->rcv_unacked = 0; |
b97bf3fd PL |
1282 | } |
1283 | ||
426cc2b8 JPM |
1284 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
1285 | u16 rcvgap, int tolerance, int priority, | |
1286 | struct sk_buff_head *xmitq) | |
1287 | { | |
1288 | struct sk_buff *skb = NULL; | |
1289 | struct tipc_msg *hdr = l->pmsg; | |
52666986 | 1290 | bool node_up = link_is_up(l->bc_rcvlink); |
426cc2b8 JPM |
1291 | |
1292 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1293 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1294 | return; |
1295 | ||
426cc2b8 JPM |
1296 | msg_set_type(hdr, mtyp); |
1297 | msg_set_net_plane(hdr, l->net_plane); | |
52666986 JPM |
1298 | msg_set_next_sent(hdr, l->snd_nxt); |
1299 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
1300 | msg_set_bcast_ack(hdr, l->bc_rcvlink->rcv_nxt - 1); | |
1301 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
426cc2b8 JPM |
1302 | msg_set_link_tolerance(hdr, tolerance); |
1303 | msg_set_linkprio(hdr, priority); | |
1304 | msg_set_redundant_link(hdr, node_up); | |
1305 | msg_set_seq_gap(hdr, 0); | |
1306 | ||
1307 | /* Compatibility: created msg must not be in sequence with pkt flow */ | |
52666986 | 1308 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1309 | |
1310 | if (mtyp == STATE_MSG) { | |
1311 | if (!tipc_link_is_up(l)) | |
1312 | return; | |
426cc2b8 JPM |
1313 | |
1314 | /* Override rcvgap if there are packets in deferred queue */ | |
1315 | if (!skb_queue_empty(&l->deferdq)) | |
52666986 | 1316 | rcvgap = buf_seqno(skb_peek(&l->deferdq)) - l->rcv_nxt; |
426cc2b8 JPM |
1317 | if (rcvgap) { |
1318 | msg_set_seq_gap(hdr, rcvgap); | |
1319 | l->stats.sent_nacks++; | |
1320 | } | |
426cc2b8 JPM |
1321 | msg_set_probe(hdr, probe); |
1322 | if (probe) | |
1323 | l->stats.sent_probes++; | |
1324 | l->stats.sent_states++; | |
52666986 | 1325 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1326 | } else { |
1327 | /* RESET_MSG or ACTIVATE_MSG */ | |
1328 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
6e498158 | 1329 | msg_set_ack(hdr, l->rcv_nxt - 1); |
426cc2b8 JPM |
1330 | msg_set_next_sent(hdr, 1); |
1331 | } | |
1332 | skb = tipc_buf_acquire(msg_size(hdr)); | |
1333 | if (!skb) | |
1334 | return; | |
1335 | skb_copy_to_linear_data(skb, hdr, msg_size(hdr)); | |
1336 | skb->priority = TC_PRIO_CONTROL; | |
6e498158 | 1337 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1338 | } |
1339 | ||
6e498158 | 1340 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1341 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1342 | */ |
6e498158 JPM |
1343 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1344 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1345 | { |
6e498158 JPM |
1346 | struct sk_buff *skb, *tnlskb; |
1347 | struct tipc_msg *hdr, tnlhdr; | |
1348 | struct sk_buff_head *queue = &l->transmq; | |
1349 | struct sk_buff_head tmpxq, tnlq; | |
1350 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1351 | |
6e498158 | 1352 | if (!tnl) |
b97bf3fd PL |
1353 | return; |
1354 | ||
6e498158 JPM |
1355 | skb_queue_head_init(&tnlq); |
1356 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1357 | |
6e498158 JPM |
1358 | /* At least one packet required for safe algorithm => add dummy */ |
1359 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1360 | BASIC_H_SIZE, 0, l->addr, link_own_addr(l), | |
1361 | 0, 0, TIPC_ERR_NO_PORT); | |
1362 | if (!skb) { | |
1363 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1364 | return; |
1365 | } | |
6e498158 JPM |
1366 | skb_queue_tail(&tnlq, skb); |
1367 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1368 | __skb_queue_purge(&tmpxq); | |
1369 | ||
1370 | /* Initialize reusable tunnel packet header */ | |
1371 | tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL, | |
1372 | mtyp, INT_H_SIZE, l->addr); | |
1373 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1374 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1375 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1376 | tnl: | |
1377 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1378 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1379 | hdr = buf_msg(skb); |
1380 | if (queue == &l->backlogq) | |
1381 | msg_set_seqno(hdr, seqno++); | |
1382 | pktlen = msg_size(hdr); | |
1383 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1384 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1385 | if (!tnlskb) { | |
1386 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1387 | return; |
1388 | } | |
6e498158 JPM |
1389 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1390 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1391 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1392 | } |
6e498158 JPM |
1393 | if (queue != &l->backlogq) { |
1394 | queue = &l->backlogq; | |
1395 | goto tnl; | |
f006c9c7 | 1396 | } |
1dab3d5a | 1397 | |
6e498158 | 1398 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1399 | |
6e498158 JPM |
1400 | if (mtyp == FAILOVER_MSG) { |
1401 | tnl->drop_point = l->rcv_nxt; | |
1402 | tnl->failover_reasm_skb = l->reasm_buf; | |
1403 | l->reasm_buf = NULL; | |
2da71425 | 1404 | } |
b97bf3fd PL |
1405 | } |
1406 | ||
d999297c JPM |
1407 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1408 | * Note that network plane id propagates through the network, and may | |
1409 | * change at any time. The node with lowest numerical id determines | |
1410 | * network plane | |
1411 | */ | |
1412 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1413 | struct sk_buff_head *xmitq) | |
1414 | { | |
1415 | struct tipc_msg *hdr = buf_msg(skb); | |
1416 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1417 | u16 ack = msg_ack(hdr); |
1418 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1419 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1420 | u16 peers_tol = msg_link_tolerance(hdr); | |
1421 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1422 | u16 rcv_nxt = l->rcv_nxt; |
73f646ce | 1423 | int mtyp = msg_type(hdr); |
d999297c JPM |
1424 | char *if_name; |
1425 | int rc = 0; | |
1426 | ||
52666986 | 1427 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1428 | goto exit; |
1429 | ||
1430 | if (link_own_addr(l) > msg_prevnode(hdr)) | |
1431 | l->net_plane = msg_net_plane(hdr); | |
1432 | ||
73f646ce | 1433 | switch (mtyp) { |
d999297c JPM |
1434 | case RESET_MSG: |
1435 | ||
1436 | /* Ignore duplicate RESET with old session number */ | |
1437 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
1438 | (l->peer_session != WILDCARD_SESSION)) | |
1439 | break; | |
1440 | /* fall thru' */ | |
662921cd | 1441 | |
d999297c | 1442 | case ACTIVATE_MSG: |
c7cad0d6 JPM |
1443 | skb_linearize(skb); |
1444 | hdr = buf_msg(skb); | |
d999297c JPM |
1445 | |
1446 | /* Complete own link name with peer's interface name */ | |
1447 | if_name = strrchr(l->name, ':') + 1; | |
1448 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1449 | break; | |
1450 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1451 | break; | |
1452 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); | |
1453 | ||
1454 | /* Update own tolerance if peer indicates a non-zero value */ | |
1455 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1456 | l->tolerance = peers_tol; | |
1457 | ||
1458 | /* Update own priority if peer's priority is higher */ | |
1459 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1460 | l->priority = peers_prio; | |
1461 | ||
73f646ce JPM |
1462 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
1463 | if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
1464 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); | |
1465 | ||
1466 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1467 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1468 | rc = TIPC_LINK_UP_EVT; | |
1469 | ||
d999297c JPM |
1470 | l->peer_session = msg_session(hdr); |
1471 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1472 | if (l->mtu > msg_max_pkt(hdr)) |
1473 | l->mtu = msg_max_pkt(hdr); | |
1474 | break; | |
662921cd | 1475 | |
d999297c | 1476 | case STATE_MSG: |
662921cd | 1477 | |
d999297c JPM |
1478 | /* Update own tolerance if peer indicates a non-zero value */ |
1479 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1480 | l->tolerance = peers_tol; | |
1481 | ||
1482 | l->silent_intv_cnt = 0; | |
1483 | l->stats.recv_states++; | |
1484 | if (msg_probe(hdr)) | |
1485 | l->stats.recv_probes++; | |
73f646ce JPM |
1486 | |
1487 | if (!link_is_up(l)) { | |
1488 | if (l->state == LINK_ESTABLISHING) | |
1489 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1490 | break; |
73f646ce | 1491 | } |
d999297c | 1492 | |
662921cd | 1493 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1494 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1495 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1496 | if (rcvgap || (msg_probe(hdr))) | |
1497 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1498 | 0, 0, xmitq); |
c1ab3f1d | 1499 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1500 | |
1501 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d JPM |
1502 | if (gap) { |
1503 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); | |
d999297c JPM |
1504 | l->stats.recv_nacks++; |
1505 | } | |
662921cd | 1506 | |
d999297c JPM |
1507 | tipc_link_advance_backlog(l, xmitq); |
1508 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1509 | link_prepare_wakeup(l); | |
1510 | } | |
1511 | exit: | |
1512 | kfree_skb(skb); | |
1513 | return rc; | |
1514 | } | |
1515 | ||
52666986 JPM |
1516 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1517 | */ | |
1518 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1519 | u16 peers_snd_nxt, | |
1520 | struct sk_buff_head *xmitq) | |
1521 | { | |
1522 | struct sk_buff *skb; | |
1523 | struct tipc_msg *hdr; | |
1524 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1525 | u16 ack = l->rcv_nxt - 1; | |
1526 | u16 gap_to = peers_snd_nxt - 1; | |
1527 | ||
1528 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
1529 | 0, l->addr, link_own_addr(l), 0, 0, 0); | |
1530 | if (!skb) | |
1531 | return false; | |
1532 | hdr = buf_msg(skb); | |
1533 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1534 | msg_set_bcast_ack(hdr, ack); | |
1535 | msg_set_bcgap_after(hdr, ack); | |
1536 | if (dfrd_skb) | |
1537 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1538 | msg_set_bcgap_to(hdr, gap_to); | |
1539 | msg_set_non_seq(hdr, bcast); | |
1540 | __skb_queue_tail(xmitq, skb); | |
1541 | return true; | |
1542 | } | |
1543 | ||
1544 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1545 | * | |
1546 | * Give a newly added peer node the sequence number where it should | |
1547 | * start receiving and acking broadcast packets. | |
1548 | */ | |
742e0383 WF |
1549 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1550 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1551 | { |
1552 | struct sk_buff_head list; | |
1553 | ||
1554 | __skb_queue_head_init(&list); | |
1555 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1556 | return; | |
1557 | tipc_link_xmit(l, &list, xmitq); | |
1558 | } | |
1559 | ||
1560 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1561 | */ | |
1562 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1563 | { | |
1564 | int mtyp = msg_type(hdr); | |
1565 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1566 | ||
1567 | if (link_is_up(l)) | |
1568 | return; | |
1569 | ||
1570 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1571 | l->rcv_nxt = peers_snd_nxt; | |
1572 | l->state = LINK_ESTABLISHED; | |
1573 | return; | |
1574 | } | |
1575 | ||
1576 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1577 | return; | |
1578 | ||
1579 | if (msg_peer_node_is_up(hdr)) | |
1580 | return; | |
1581 | ||
1582 | /* Compatibility: accept older, less safe initial synch data */ | |
1583 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1584 | l->rcv_nxt = peers_snd_nxt; | |
1585 | } | |
1586 | ||
1587 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
1588 | */ | |
1589 | void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, | |
1590 | struct sk_buff_head *xmitq) | |
1591 | { | |
1592 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1593 | ||
1594 | if (!link_is_up(l)) | |
1595 | return; | |
1596 | ||
1597 | if (!msg_peer_node_is_up(hdr)) | |
1598 | return; | |
1599 | ||
1600 | l->bc_peer_is_up = true; | |
1601 | ||
1602 | /* Ignore if peers_snd_nxt goes beyond receive window */ | |
1603 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
1604 | return; | |
1605 | ||
1606 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1607 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
1608 | return; | |
1609 | } | |
1610 | ||
1611 | /* Don't NACK if one was recently sent or peeked */ | |
1612 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1613 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1614 | return; | |
1615 | } | |
1616 | ||
1617 | /* Conditionally delay NACK sending until next synch rcv */ | |
1618 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1619 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1620 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
1621 | return; | |
1622 | } | |
1623 | ||
1624 | /* Send NACK now but suppress next one */ | |
1625 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1626 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1627 | } | |
1628 | ||
1629 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1630 | struct sk_buff_head *xmitq) | |
1631 | { | |
1632 | struct sk_buff *skb, *tmp; | |
1633 | struct tipc_link *snd_l = l->bc_sndlink; | |
1634 | ||
1635 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1636 | return; | |
1637 | ||
1638 | if (!more(acked, l->acked)) | |
1639 | return; | |
1640 | ||
1641 | /* Skip over packets peer has already acked */ | |
1642 | skb_queue_walk(&snd_l->transmq, skb) { | |
1643 | if (more(buf_seqno(skb), l->acked)) | |
1644 | break; | |
1645 | } | |
1646 | ||
1647 | /* Update/release the packets peer is acking now */ | |
1648 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1649 | if (more(buf_seqno(skb), acked)) | |
1650 | break; | |
1651 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1652 | __skb_unlink(skb, &snd_l->transmq); | |
1653 | kfree_skb(skb); | |
1654 | } | |
1655 | } | |
1656 | l->acked = acked; | |
1657 | tipc_link_advance_backlog(snd_l, xmitq); | |
1658 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1659 | link_prepare_wakeup(snd_l); | |
1660 | } | |
1661 | ||
1662 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
1663 | */ | |
1664 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1665 | struct sk_buff_head *xmitq) | |
1666 | { | |
1667 | struct tipc_msg *hdr = buf_msg(skb); | |
1668 | u32 dnode = msg_destnode(hdr); | |
1669 | int mtyp = msg_type(hdr); | |
1670 | u16 acked = msg_bcast_ack(hdr); | |
1671 | u16 from = acked + 1; | |
1672 | u16 to = msg_bcgap_to(hdr); | |
1673 | u16 peers_snd_nxt = to + 1; | |
1674 | int rc = 0; | |
1675 | ||
1676 | kfree_skb(skb); | |
1677 | ||
1678 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1679 | return 0; | |
1680 | ||
1681 | if (mtyp != STATE_MSG) | |
1682 | return 0; | |
1683 | ||
1684 | if (dnode == link_own_addr(l)) { | |
1685 | tipc_link_bc_ack_rcv(l, acked, xmitq); | |
1686 | rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq); | |
1687 | l->stats.recv_nacks++; | |
1688 | return rc; | |
1689 | } | |
1690 | ||
1691 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1692 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1693 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1694 | ||
1695 | return 0; | |
1696 | } | |
1697 | ||
e3eea1eb | 1698 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1699 | { |
ed193ece | 1700 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1701 | |
1702 | l->window = win; | |
1f66d161 JPM |
1703 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1704 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1705 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1706 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1707 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1708 | } |
1709 | ||
b97bf3fd | 1710 | /** |
38206d59 | 1711 | * link_reset_stats - reset link statistics |
1a90632d | 1712 | * @l: pointer to link |
b97bf3fd | 1713 | */ |
38206d59 | 1714 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 1715 | { |
38206d59 JPM |
1716 | memset(&l->stats, 0, sizeof(l->stats)); |
1717 | if (!link_is_bc_sndlink(l)) { | |
1718 | l->stats.sent_info = l->snd_nxt; | |
1719 | l->stats.recv_info = l->rcv_nxt; | |
1720 | } | |
b97bf3fd PL |
1721 | } |
1722 | ||
1a20cc25 | 1723 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1724 | { |
1a20cc25 | 1725 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1726 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1727 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1728 | |
662921cd | 1729 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1730 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1731 | skb_queue_len(&l->transmq), head, tail, | |
1732 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1733 | } |
0655f6a8 RA |
1734 | |
1735 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1736 | */ | |
1737 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1738 | { | |
1739 | int err; | |
1740 | ||
1741 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1742 | tipc_nl_prop_policy); | |
1743 | if (err) | |
1744 | return err; | |
1745 | ||
1746 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1747 | u32 prio; | |
1748 | ||
1749 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1750 | if (prio > TIPC_MAX_LINK_PRI) | |
1751 | return -EINVAL; | |
1752 | } | |
1753 | ||
1754 | if (props[TIPC_NLA_PROP_TOL]) { | |
1755 | u32 tol; | |
1756 | ||
1757 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1758 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1759 | return -EINVAL; | |
1760 | } | |
1761 | ||
1762 | if (props[TIPC_NLA_PROP_WIN]) { | |
1763 | u32 win; | |
1764 | ||
1765 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1766 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1767 | return -EINVAL; | |
1768 | } | |
1769 | ||
1770 | return 0; | |
1771 | } | |
7be57fc6 | 1772 | |
d8182804 | 1773 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
1774 | { |
1775 | int i; | |
1776 | struct nlattr *stats; | |
1777 | ||
1778 | struct nla_map { | |
1779 | u32 key; | |
1780 | u32 val; | |
1781 | }; | |
1782 | ||
1783 | struct nla_map map[] = { | |
1784 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1785 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1786 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1787 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1788 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1789 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1790 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1791 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1792 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1793 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1794 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1795 | s->msg_length_counts : 1}, | |
1796 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1797 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1798 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1799 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1800 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1801 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1802 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1803 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1804 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1805 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1806 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1807 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1808 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1809 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1810 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1811 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1812 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1813 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1814 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1815 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1816 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1817 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1818 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1819 | }; | |
1820 | ||
1821 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1822 | if (!stats) | |
1823 | return -EMSGSIZE; | |
1824 | ||
1825 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1826 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1827 | goto msg_full; | |
1828 | ||
1829 | nla_nest_end(skb, stats); | |
1830 | ||
1831 | return 0; | |
1832 | msg_full: | |
1833 | nla_nest_cancel(skb, stats); | |
1834 | ||
1835 | return -EMSGSIZE; | |
1836 | } | |
1837 | ||
1838 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
1839 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
1840 | struct tipc_link *link, int nlflags) | |
7be57fc6 RA |
1841 | { |
1842 | int err; | |
1843 | void *hdr; | |
1844 | struct nlattr *attrs; | |
1845 | struct nlattr *prop; | |
34747539 | 1846 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1847 | |
bfb3e5dd | 1848 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1849 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1850 | if (!hdr) |
1851 | return -EMSGSIZE; | |
1852 | ||
1853 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1854 | if (!attrs) | |
1855 | goto msg_full; | |
1856 | ||
1857 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1858 | goto attr_msg_full; | |
1859 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1860 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1861 | goto attr_msg_full; |
ed193ece | 1862 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1863 | goto attr_msg_full; |
a97b9d3f | 1864 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1865 | goto attr_msg_full; |
a97b9d3f | 1866 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1867 | goto attr_msg_full; |
1868 | ||
1869 | if (tipc_link_is_up(link)) | |
1870 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1871 | goto attr_msg_full; | |
c72fa872 | 1872 | if (link->active) |
7be57fc6 RA |
1873 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
1874 | goto attr_msg_full; | |
1875 | ||
1876 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1877 | if (!prop) | |
1878 | goto attr_msg_full; | |
1879 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1880 | goto prop_msg_full; | |
1881 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1882 | goto prop_msg_full; | |
1883 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1884 | link->window)) |
7be57fc6 RA |
1885 | goto prop_msg_full; |
1886 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1887 | goto prop_msg_full; | |
1888 | nla_nest_end(msg->skb, prop); | |
1889 | ||
1890 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1891 | if (err) | |
1892 | goto attr_msg_full; | |
1893 | ||
1894 | nla_nest_end(msg->skb, attrs); | |
1895 | genlmsg_end(msg->skb, hdr); | |
1896 | ||
1897 | return 0; | |
1898 | ||
1899 | prop_msg_full: | |
1900 | nla_nest_cancel(msg->skb, prop); | |
1901 | attr_msg_full: | |
1902 | nla_nest_cancel(msg->skb, attrs); | |
1903 | msg_full: | |
1904 | genlmsg_cancel(msg->skb, hdr); | |
1905 | ||
1906 | return -EMSGSIZE; | |
1907 | } | |
38206d59 JPM |
1908 | |
1909 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
1910 | struct tipc_stats *stats) | |
1911 | { | |
1912 | int i; | |
1913 | struct nlattr *nest; | |
1914 | ||
1915 | struct nla_map { | |
1916 | __u32 key; | |
1917 | __u32 val; | |
1918 | }; | |
1919 | ||
1920 | struct nla_map map[] = { | |
1921 | {TIPC_NLA_STATS_RX_INFO, stats->recv_info}, | |
1922 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, | |
1923 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
1924 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
1925 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
1926 | {TIPC_NLA_STATS_TX_INFO, stats->sent_info}, | |
1927 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, | |
1928 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
1929 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
1930 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
1931 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
1932 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
1933 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
1934 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
1935 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
1936 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
1937 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
1938 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
1939 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
1940 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
1941 | }; | |
1942 | ||
1943 | nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1944 | if (!nest) | |
1945 | return -EMSGSIZE; | |
1946 | ||
1947 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1948 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1949 | goto msg_full; | |
1950 | ||
1951 | nla_nest_end(skb, nest); | |
1952 | ||
1953 | return 0; | |
1954 | msg_full: | |
1955 | nla_nest_cancel(skb, nest); | |
1956 | ||
1957 | return -EMSGSIZE; | |
1958 | } | |
1959 | ||
1960 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
1961 | { | |
1962 | int err; | |
1963 | void *hdr; | |
1964 | struct nlattr *attrs; | |
1965 | struct nlattr *prop; | |
1966 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
1967 | struct tipc_link *bcl = tn->bcl; | |
1968 | ||
1969 | if (!bcl) | |
1970 | return 0; | |
1971 | ||
1972 | tipc_bcast_lock(net); | |
1973 | ||
1974 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
1975 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
1976 | if (!hdr) { |
1977 | tipc_bcast_unlock(net); | |
38206d59 | 1978 | return -EMSGSIZE; |
b53ce3e7 | 1979 | } |
38206d59 JPM |
1980 | |
1981 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1982 | if (!attrs) | |
1983 | goto msg_full; | |
1984 | ||
1985 | /* The broadcast link is always up */ | |
1986 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1987 | goto attr_msg_full; | |
1988 | ||
1989 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
1990 | goto attr_msg_full; | |
1991 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
1992 | goto attr_msg_full; | |
1993 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt)) | |
1994 | goto attr_msg_full; | |
1995 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt)) | |
1996 | goto attr_msg_full; | |
1997 | ||
1998 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1999 | if (!prop) | |
2000 | goto attr_msg_full; | |
2001 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
2002 | goto prop_msg_full; | |
2003 | nla_nest_end(msg->skb, prop); | |
2004 | ||
2005 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2006 | if (err) | |
2007 | goto attr_msg_full; | |
2008 | ||
2009 | tipc_bcast_unlock(net); | |
2010 | nla_nest_end(msg->skb, attrs); | |
2011 | genlmsg_end(msg->skb, hdr); | |
2012 | ||
2013 | return 0; | |
2014 | ||
2015 | prop_msg_full: | |
2016 | nla_nest_cancel(msg->skb, prop); | |
2017 | attr_msg_full: | |
2018 | nla_nest_cancel(msg->skb, attrs); | |
2019 | msg_full: | |
2020 | tipc_bcast_unlock(net); | |
2021 | genlmsg_cancel(msg->skb, hdr); | |
2022 | ||
2023 | return -EMSGSIZE; | |
2024 | } | |
2025 | ||
2026 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol) | |
2027 | { | |
2028 | l->tolerance = tol; | |
2029 | tipc_link_proto_xmit(l, STATE_MSG, 0, 0, tol, 0); | |
2030 | } | |
2031 | ||
2032 | void tipc_link_set_prio(struct tipc_link *l, u32 prio) | |
2033 | { | |
2034 | l->priority = prio; | |
2035 | tipc_link_proto_xmit(l, STATE_MSG, 0, 0, 0, prio); | |
2036 | } | |
2037 | ||
2038 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2039 | { | |
2040 | l->abort_limit = limit; | |
2041 | } |