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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" |
b4b9771b | 46 | #include "trace.h" |
b97bf3fd | 47 | |
796c75d0 YX |
48 | #include <linux/pkt_sched.h> |
49 | ||
38206d59 | 50 | struct tipc_stats { |
95901122 JPM |
51 | u32 sent_pkts; |
52 | u32 recv_pkts; | |
38206d59 JPM |
53 | u32 sent_states; |
54 | u32 recv_states; | |
55 | u32 sent_probes; | |
56 | u32 recv_probes; | |
57 | u32 sent_nacks; | |
58 | u32 recv_nacks; | |
59 | u32 sent_acks; | |
60 | u32 sent_bundled; | |
61 | u32 sent_bundles; | |
62 | u32 recv_bundled; | |
63 | u32 recv_bundles; | |
64 | u32 retransmitted; | |
65 | u32 sent_fragmented; | |
66 | u32 sent_fragments; | |
67 | u32 recv_fragmented; | |
68 | u32 recv_fragments; | |
69 | u32 link_congs; /* # port sends blocked by congestion */ | |
70 | u32 deferred_recv; | |
71 | u32 duplicates; | |
72 | u32 max_queue_sz; /* send queue size high water mark */ | |
73 | u32 accu_queue_sz; /* used for send queue size profiling */ | |
74 | u32 queue_sz_counts; /* used for send queue size profiling */ | |
75 | u32 msg_length_counts; /* used for message length profiling */ | |
76 | u32 msg_lengths_total; /* used for message length profiling */ | |
77 | u32 msg_length_profile[7]; /* used for msg. length profiling */ | |
78 | }; | |
79 | ||
80 | /** | |
81 | * struct tipc_link - TIPC link data structure | |
82 | * @addr: network address of link's peer node | |
83 | * @name: link name character string | |
84 | * @media_addr: media address to use when sending messages over link | |
85 | * @timer: link timer | |
86 | * @net: pointer to namespace struct | |
87 | * @refcnt: reference counter for permanent references (owner node & timer) | |
88 | * @peer_session: link session # being used by peer end of link | |
89 | * @peer_bearer_id: bearer id used by link's peer endpoint | |
90 | * @bearer_id: local bearer id used by link | |
91 | * @tolerance: minimum link continuity loss needed to reset link [in ms] | |
38206d59 JPM |
92 | * @abort_limit: # of unacknowledged continuity probes needed to reset link |
93 | * @state: current state of link FSM | |
94 | * @peer_caps: bitmap describing capabilities of peer node | |
95 | * @silent_intv_cnt: # of timer intervals without any reception from peer | |
96 | * @proto_msg: template for control messages generated by link | |
97 | * @pmsg: convenience pointer to "proto_msg" field | |
98 | * @priority: current link priority | |
99 | * @net_plane: current link network plane ('A' through 'H') | |
35c55c98 | 100 | * @mon_state: cookie with information needed by link monitor |
38206d59 JPM |
101 | * @backlog_limit: backlog queue congestion thresholds (indexed by importance) |
102 | * @exp_msg_count: # of tunnelled messages expected during link changeover | |
103 | * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset | |
104 | * @mtu: current maximum packet size for this link | |
105 | * @advertised_mtu: advertised own mtu when link is being established | |
106 | * @transmitq: queue for sent, non-acked messages | |
107 | * @backlogq: queue for messages waiting to be sent | |
108 | * @snt_nxt: next sequence number to use for outbound messages | |
38206d59 JPM |
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]; | |
38206d59 JPM |
126 | struct net *net; |
127 | ||
128 | /* Management and link supervision data */ | |
7ea817f4 JM |
129 | u16 peer_session; |
130 | u16 session; | |
9012de50 JM |
131 | u16 snd_nxt_state; |
132 | u16 rcv_nxt_state; | |
38206d59 JPM |
133 | u32 peer_bearer_id; |
134 | u32 bearer_id; | |
135 | u32 tolerance; | |
38206d59 JPM |
136 | u32 abort_limit; |
137 | u32 state; | |
138 | u16 peer_caps; | |
7ea817f4 | 139 | bool in_session; |
38206d59 JPM |
140 | bool active; |
141 | u32 silent_intv_cnt; | |
e74a386d | 142 | char if_name[TIPC_MAX_IF_NAME]; |
38206d59 JPM |
143 | u32 priority; |
144 | char net_plane; | |
35c55c98 | 145 | struct tipc_mon_state mon_state; |
88e8ac70 | 146 | u16 rst_cnt; |
38206d59 JPM |
147 | |
148 | /* Failover/synch */ | |
149 | u16 drop_point; | |
150 | struct sk_buff *failover_reasm_skb; | |
58ee86b8 | 151 | struct sk_buff_head failover_deferdq; |
38206d59 JPM |
152 | |
153 | /* Max packet negotiation */ | |
154 | u16 mtu; | |
155 | u16 advertised_mtu; | |
156 | ||
157 | /* Sending */ | |
158 | struct sk_buff_head transmq; | |
159 | struct sk_buff_head backlogq; | |
160 | struct { | |
161 | u16 len; | |
162 | u16 limit; | |
e95584a8 | 163 | struct sk_buff *target_bskb; |
38206d59 JPM |
164 | } backlog[5]; |
165 | u16 snd_nxt; | |
38206d59 | 166 | u16 window; |
38206d59 JPM |
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; | |
2320bcda | 180 | struct sk_buff *reasm_tnlmsg; |
38206d59 JPM |
181 | |
182 | /* Broadcast */ | |
183 | u16 ackers; | |
184 | u16 acked; | |
185 | struct tipc_link *bc_rcvlink; | |
186 | struct tipc_link *bc_sndlink; | |
7c4a54b9 | 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 | ||
53962bce | 208 | #define TIPC_BC_RETR_LIM (jiffies + msecs_to_jiffies(10)) |
382f598f | 209 | #define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1)) |
7c4a54b9 | 210 | |
d999297c JPM |
211 | /* |
212 | * Interval between NACKs when packets arrive out of order | |
213 | */ | |
214 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
e74a386d | 215 | |
662921cd | 216 | /* Link FSM states: |
b97bf3fd | 217 | */ |
d3504c34 | 218 | enum { |
662921cd JPM |
219 | LINK_ESTABLISHED = 0xe, |
220 | LINK_ESTABLISHING = 0xe << 4, | |
221 | LINK_RESET = 0x1 << 8, | |
222 | LINK_RESETTING = 0x2 << 12, | |
223 | LINK_PEER_RESET = 0xd << 16, | |
224 | LINK_FAILINGOVER = 0xf << 20, | |
225 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
226 | }; |
227 | ||
228 | /* Link FSM state checking routines | |
229 | */ | |
662921cd | 230 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 231 | { |
662921cd | 232 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 233 | } |
b97bf3fd | 234 | |
d999297c JPM |
235 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
236 | struct sk_buff_head *xmitq); | |
426cc2b8 | 237 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
238 | bool probe_reply, u16 rcvgap, |
239 | int tolerance, int priority, | |
426cc2b8 | 240 | struct sk_buff_head *xmitq); |
1a90632d | 241 | static void link_print(struct tipc_link *l, const char *str); |
e0a05ebe JPM |
242 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
243 | struct sk_buff_head *xmitq); | |
52666986 JPM |
244 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
245 | struct sk_buff_head *xmitq); | |
246 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
9195948f | 247 | static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data); |
6a6b5c8b TL |
248 | static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap, |
249 | struct tipc_gap_ack_blks *ga, | |
250 | struct sk_buff_head *xmitq); | |
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 | ||
c72fa872 JPM |
300 | void tipc_link_set_active(struct tipc_link *l, bool active) |
301 | { | |
302 | l->active = active; | |
b97bf3fd PL |
303 | } |
304 | ||
38206d59 JPM |
305 | u32 tipc_link_id(struct tipc_link *l) |
306 | { | |
307 | return l->peer_bearer_id << 16 | l->bearer_id; | |
308 | } | |
309 | ||
310 | int tipc_link_window(struct tipc_link *l) | |
311 | { | |
312 | return l->window; | |
313 | } | |
314 | ||
315 | int tipc_link_prio(struct tipc_link *l) | |
316 | { | |
317 | return l->priority; | |
318 | } | |
319 | ||
320 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
321 | { | |
322 | return l->tolerance; | |
323 | } | |
324 | ||
325 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
326 | { | |
327 | return l->inputq; | |
328 | } | |
329 | ||
330 | char tipc_link_plane(struct tipc_link *l) | |
331 | { | |
332 | return l->net_plane; | |
333 | } | |
334 | ||
9012de50 JM |
335 | void tipc_link_update_caps(struct tipc_link *l, u16 capabilities) |
336 | { | |
337 | l->peer_caps = capabilities; | |
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 | 361 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); |
26574db0 | 362 | trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!"); |
52666986 JPM |
363 | tipc_link_reset(rcv_l); |
364 | rcv_l->state = LINK_RESET; | |
365 | if (!snd_l->ackers) { | |
26574db0 | 366 | trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!"); |
52666986 | 367 | tipc_link_reset(snd_l); |
9a650838 | 368 | snd_l->state = LINK_RESET; |
52666986 JPM |
369 | __skb_queue_purge(xmitq); |
370 | } | |
2f566124 JPM |
371 | } |
372 | ||
373 | int tipc_link_bc_peers(struct tipc_link *l) | |
374 | { | |
375 | return l->ackers; | |
376 | } | |
377 | ||
e064cce1 | 378 | static u16 link_bc_rcv_gap(struct tipc_link *l) |
02d11ca2 JPM |
379 | { |
380 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
381 | u16 gap = 0; | |
382 | ||
383 | if (more(l->snd_nxt, l->rcv_nxt)) | |
384 | gap = l->snd_nxt - l->rcv_nxt; | |
385 | if (skb) | |
386 | gap = buf_seqno(skb) - l->rcv_nxt; | |
387 | return gap; | |
388 | } | |
389 | ||
959e1781 JPM |
390 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
391 | { | |
392 | l->mtu = mtu; | |
393 | } | |
394 | ||
395 | int tipc_link_mtu(struct tipc_link *l) | |
396 | { | |
397 | return l->mtu; | |
398 | } | |
399 | ||
38206d59 JPM |
400 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
401 | { | |
402 | return l->rcv_nxt; | |
403 | } | |
404 | ||
405 | u16 tipc_link_acked(struct tipc_link *l) | |
406 | { | |
407 | return l->acked; | |
408 | } | |
409 | ||
410 | char *tipc_link_name(struct tipc_link *l) | |
411 | { | |
412 | return l->name; | |
413 | } | |
414 | ||
c140eb16 LDC |
415 | u32 tipc_link_state(struct tipc_link *l) |
416 | { | |
417 | return l->state; | |
418 | } | |
419 | ||
b97bf3fd | 420 | /** |
4323add6 | 421 | * tipc_link_create - create a new link |
440d8963 | 422 | * @n: pointer to associated node |
0e05498e JPM |
423 | * @if_name: associated interface name |
424 | * @bearer_id: id (index) of associated bearer | |
425 | * @tolerance: link tolerance to be used by link | |
426 | * @net_plane: network plane (A,B,c..) this link belongs to | |
427 | * @mtu: mtu to be advertised by link | |
428 | * @priority: priority to be used by link | |
429 | * @window: send window to be used by link | |
430 | * @session: session to be used by link | |
440d8963 | 431 | * @ownnode: identity of own node |
0e05498e | 432 | * @peer: node id of peer node |
fd556f20 | 433 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
434 | * @bc_sndlink: the namespace global link used for broadcast sending |
435 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
436 | * @inputq: queue to put messages ready for delivery |
437 | * @namedq: queue to put binding table update messages ready for delivery | |
438 | * @link: return value, pointer to put the created link | |
c4307285 | 439 | * |
440d8963 | 440 | * Returns true if link was created, otherwise false |
b97bf3fd | 441 | */ |
c72fa872 | 442 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e | 443 | int tolerance, char net_plane, u32 mtu, int priority, |
25b0b9c4 JM |
444 | int window, u32 session, u32 self, |
445 | u32 peer, u8 *peer_id, u16 peer_caps, | |
52666986 JPM |
446 | struct tipc_link *bc_sndlink, |
447 | struct tipc_link *bc_rcvlink, | |
448 | struct sk_buff_head *inputq, | |
449 | struct sk_buff_head *namedq, | |
440d8963 | 450 | struct tipc_link **link) |
b97bf3fd | 451 | { |
25b0b9c4 JM |
452 | char peer_str[NODE_ID_STR_LEN] = {0,}; |
453 | char self_str[NODE_ID_STR_LEN] = {0,}; | |
440d8963 | 454 | struct tipc_link *l; |
37b9c08a | 455 | |
440d8963 JPM |
456 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
457 | if (!l) | |
458 | return false; | |
459 | *link = l; | |
e74a386d | 460 | l->session = session; |
37b9c08a | 461 | |
25b0b9c4 JM |
462 | /* Set link name for unicast links only */ |
463 | if (peer_id) { | |
464 | tipc_nodeid2string(self_str, tipc_own_id(net)); | |
465 | if (strlen(self_str) > 16) | |
466 | sprintf(self_str, "%x", self); | |
467 | tipc_nodeid2string(peer_str, peer_id); | |
468 | if (strlen(peer_str) > 16) | |
469 | sprintf(peer_str, "%x", peer); | |
470 | } | |
471 | /* Peer i/f name will be completed by reset/activate message */ | |
7494cfa6 JM |
472 | snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown", |
473 | self_str, if_name, peer_str); | |
25b0b9c4 | 474 | |
e74a386d | 475 | strcpy(l->if_name, if_name); |
440d8963 | 476 | l->addr = peer; |
fd556f20 | 477 | l->peer_caps = peer_caps; |
c72fa872 | 478 | l->net = net; |
7ea817f4 | 479 | l->in_session = false; |
0e05498e JPM |
480 | l->bearer_id = bearer_id; |
481 | l->tolerance = tolerance; | |
047491ea JM |
482 | if (bc_rcvlink) |
483 | bc_rcvlink->tolerance = tolerance; | |
0e05498e JPM |
484 | l->net_plane = net_plane; |
485 | l->advertised_mtu = mtu; | |
486 | l->mtu = mtu; | |
487 | l->priority = priority; | |
488 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 489 | l->ackers = 1; |
52666986 JPM |
490 | l->bc_sndlink = bc_sndlink; |
491 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
492 | l->inputq = inputq; |
493 | l->namedq = namedq; | |
494 | l->state = LINK_RESETTING; | |
440d8963 JPM |
495 | __skb_queue_head_init(&l->transmq); |
496 | __skb_queue_head_init(&l->backlogq); | |
497 | __skb_queue_head_init(&l->deferdq); | |
58ee86b8 | 498 | __skb_queue_head_init(&l->failover_deferdq); |
440d8963 JPM |
499 | skb_queue_head_init(&l->wakeupq); |
500 | skb_queue_head_init(l->inputq); | |
501 | return true; | |
b97bf3fd PL |
502 | } |
503 | ||
32301906 JPM |
504 | /** |
505 | * tipc_link_bc_create - create new link to be used for broadcast | |
506 | * @n: pointer to associated node | |
4c94cc2d | 507 | * @mtu: mtu to be used initially if no peers |
32301906 JPM |
508 | * @window: send window to be used |
509 | * @inputq: queue to put messages ready for delivery | |
510 | * @namedq: queue to put binding table update messages ready for delivery | |
511 | * @link: return value, pointer to put the created link | |
512 | * | |
513 | * Returns true if link was created, otherwise false | |
514 | */ | |
c72fa872 | 515 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 516 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
517 | struct sk_buff_head *inputq, |
518 | struct sk_buff_head *namedq, | |
52666986 | 519 | struct tipc_link *bc_sndlink, |
32301906 JPM |
520 | struct tipc_link **link) |
521 | { | |
522 | struct tipc_link *l; | |
523 | ||
c72fa872 | 524 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
25b0b9c4 | 525 | 0, ownnode, peer, NULL, peer_caps, bc_sndlink, |
52666986 | 526 | NULL, inputq, namedq, link)) |
32301906 JPM |
527 | return false; |
528 | ||
529 | l = *link; | |
530 | strcpy(l->name, tipc_bclink_name); | |
26574db0 | 531 | trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!"); |
32301906 | 532 | tipc_link_reset(l); |
52666986 | 533 | l->state = LINK_RESET; |
2f566124 | 534 | l->ackers = 0; |
52666986 | 535 | l->bc_rcvlink = l; |
32301906 | 536 | |
52666986 JPM |
537 | /* Broadcast send link is always up */ |
538 | if (link_is_bc_sndlink(l)) | |
539 | l->state = LINK_ESTABLISHED; | |
d999297c | 540 | |
01fd12bb JPM |
541 | /* Disable replicast if even a single peer doesn't support it */ |
542 | if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) | |
543 | tipc_bcast_disable_rcast(net); | |
544 | ||
52666986 | 545 | return true; |
d999297c JPM |
546 | } |
547 | ||
6ab30f9c JPM |
548 | /** |
549 | * tipc_link_fsm_evt - link finite state machine | |
550 | * @l: pointer to link | |
551 | * @evt: state machine event to be processed | |
6ab30f9c | 552 | */ |
662921cd | 553 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 554 | { |
5045f7b9 | 555 | int rc = 0; |
26574db0 | 556 | int old_state = l->state; |
6ab30f9c JPM |
557 | |
558 | switch (l->state) { | |
662921cd | 559 | case LINK_RESETTING: |
6ab30f9c | 560 | switch (evt) { |
662921cd JPM |
561 | case LINK_PEER_RESET_EVT: |
562 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 563 | break; |
662921cd JPM |
564 | case LINK_RESET_EVT: |
565 | l->state = LINK_RESET; | |
566 | break; | |
567 | case LINK_FAILURE_EVT: | |
568 | case LINK_FAILOVER_BEGIN_EVT: | |
569 | case LINK_ESTABLISH_EVT: | |
570 | case LINK_FAILOVER_END_EVT: | |
571 | case LINK_SYNCH_BEGIN_EVT: | |
572 | case LINK_SYNCH_END_EVT: | |
573 | default: | |
574 | goto illegal_evt; | |
575 | } | |
576 | break; | |
577 | case LINK_RESET: | |
578 | switch (evt) { | |
579 | case LINK_PEER_RESET_EVT: | |
580 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 581 | break; |
662921cd JPM |
582 | case LINK_FAILOVER_BEGIN_EVT: |
583 | l->state = LINK_FAILINGOVER; | |
584 | case LINK_FAILURE_EVT: | |
585 | case LINK_RESET_EVT: | |
586 | case LINK_ESTABLISH_EVT: | |
587 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 588 | break; |
662921cd JPM |
589 | case LINK_SYNCH_BEGIN_EVT: |
590 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 591 | default: |
662921cd | 592 | goto illegal_evt; |
6ab30f9c JPM |
593 | } |
594 | break; | |
662921cd | 595 | case LINK_PEER_RESET: |
6ab30f9c | 596 | switch (evt) { |
662921cd JPM |
597 | case LINK_RESET_EVT: |
598 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 599 | break; |
662921cd JPM |
600 | case LINK_PEER_RESET_EVT: |
601 | case LINK_ESTABLISH_EVT: | |
602 | case LINK_FAILURE_EVT: | |
6ab30f9c | 603 | break; |
662921cd JPM |
604 | case LINK_SYNCH_BEGIN_EVT: |
605 | case LINK_SYNCH_END_EVT: | |
606 | case LINK_FAILOVER_BEGIN_EVT: | |
607 | case LINK_FAILOVER_END_EVT: | |
608 | default: | |
609 | goto illegal_evt; | |
610 | } | |
611 | break; | |
612 | case LINK_FAILINGOVER: | |
613 | switch (evt) { | |
614 | case LINK_FAILOVER_END_EVT: | |
615 | l->state = LINK_RESET; | |
6ab30f9c | 616 | break; |
662921cd JPM |
617 | case LINK_PEER_RESET_EVT: |
618 | case LINK_RESET_EVT: | |
619 | case LINK_ESTABLISH_EVT: | |
620 | case LINK_FAILURE_EVT: | |
621 | break; | |
622 | case LINK_FAILOVER_BEGIN_EVT: | |
623 | case LINK_SYNCH_BEGIN_EVT: | |
624 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 625 | default: |
662921cd | 626 | goto illegal_evt; |
6ab30f9c JPM |
627 | } |
628 | break; | |
662921cd | 629 | case LINK_ESTABLISHING: |
6ab30f9c | 630 | switch (evt) { |
662921cd JPM |
631 | case LINK_ESTABLISH_EVT: |
632 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 633 | break; |
662921cd JPM |
634 | case LINK_FAILOVER_BEGIN_EVT: |
635 | l->state = LINK_FAILINGOVER; | |
636 | break; | |
662921cd | 637 | case LINK_RESET_EVT: |
73f646ce JPM |
638 | l->state = LINK_RESET; |
639 | break; | |
662921cd | 640 | case LINK_FAILURE_EVT: |
73f646ce | 641 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
642 | case LINK_SYNCH_BEGIN_EVT: |
643 | case LINK_FAILOVER_END_EVT: | |
644 | break; | |
645 | case LINK_SYNCH_END_EVT: | |
646 | default: | |
647 | goto illegal_evt; | |
648 | } | |
649 | break; | |
650 | case LINK_ESTABLISHED: | |
651 | switch (evt) { | |
652 | case LINK_PEER_RESET_EVT: | |
653 | l->state = LINK_PEER_RESET; | |
654 | rc |= TIPC_LINK_DOWN_EVT; | |
655 | break; | |
656 | case LINK_FAILURE_EVT: | |
657 | l->state = LINK_RESETTING; | |
658 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 659 | break; |
662921cd JPM |
660 | case LINK_RESET_EVT: |
661 | l->state = LINK_RESET; | |
6ab30f9c | 662 | break; |
662921cd | 663 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 664 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 665 | break; |
662921cd JPM |
666 | case LINK_SYNCH_BEGIN_EVT: |
667 | l->state = LINK_SYNCHING; | |
668 | break; | |
662921cd JPM |
669 | case LINK_FAILOVER_BEGIN_EVT: |
670 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 671 | default: |
662921cd | 672 | goto illegal_evt; |
6ab30f9c JPM |
673 | } |
674 | break; | |
662921cd | 675 | case LINK_SYNCHING: |
6ab30f9c | 676 | switch (evt) { |
662921cd JPM |
677 | case LINK_PEER_RESET_EVT: |
678 | l->state = LINK_PEER_RESET; | |
679 | rc |= TIPC_LINK_DOWN_EVT; | |
680 | break; | |
681 | case LINK_FAILURE_EVT: | |
682 | l->state = LINK_RESETTING; | |
683 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 684 | break; |
662921cd JPM |
685 | case LINK_RESET_EVT: |
686 | l->state = LINK_RESET; | |
6ab30f9c | 687 | break; |
662921cd JPM |
688 | case LINK_ESTABLISH_EVT: |
689 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 690 | break; |
662921cd JPM |
691 | case LINK_SYNCH_END_EVT: |
692 | l->state = LINK_ESTABLISHED; | |
693 | break; | |
694 | case LINK_FAILOVER_BEGIN_EVT: | |
695 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 696 | default: |
662921cd | 697 | goto illegal_evt; |
6ab30f9c JPM |
698 | } |
699 | break; | |
700 | default: | |
662921cd | 701 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 702 | } |
26574db0 | 703 | trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
662921cd JPM |
704 | return rc; |
705 | illegal_evt: | |
706 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
707 | evt, l->state, l->name); | |
26574db0 | 708 | trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
6ab30f9c JPM |
709 | return rc; |
710 | } | |
711 | ||
333ef69e JPM |
712 | /* link_profile_stats - update statistical profiling of traffic |
713 | */ | |
714 | static void link_profile_stats(struct tipc_link *l) | |
715 | { | |
716 | struct sk_buff *skb; | |
717 | struct tipc_msg *msg; | |
718 | int length; | |
719 | ||
720 | /* Update counters used in statistical profiling of send traffic */ | |
721 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
722 | l->stats.queue_sz_counts++; | |
723 | ||
724 | skb = skb_peek(&l->transmq); | |
725 | if (!skb) | |
726 | return; | |
727 | msg = buf_msg(skb); | |
728 | length = msg_size(msg); | |
729 | ||
730 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
731 | if (msg_type(msg) != FIRST_FRAGMENT) | |
732 | return; | |
a7dc51ad | 733 | length = msg_size(msg_inner_hdr(msg)); |
333ef69e JPM |
734 | } |
735 | l->stats.msg_lengths_total += length; | |
736 | l->stats.msg_length_counts++; | |
737 | if (length <= 64) | |
738 | l->stats.msg_length_profile[0]++; | |
739 | else if (length <= 256) | |
740 | l->stats.msg_length_profile[1]++; | |
741 | else if (length <= 1024) | |
742 | l->stats.msg_length_profile[2]++; | |
743 | else if (length <= 4096) | |
744 | l->stats.msg_length_profile[3]++; | |
745 | else if (length <= 16384) | |
746 | l->stats.msg_length_profile[4]++; | |
747 | else if (length <= 32768) | |
748 | l->stats.msg_length_profile[5]++; | |
749 | else | |
750 | l->stats.msg_length_profile[6]++; | |
751 | } | |
752 | ||
26574db0 TL |
753 | /** |
754 | * tipc_link_too_silent - check if link is "too silent" | |
755 | * @l: tipc link to be checked | |
756 | * | |
757 | * Returns true if the link 'silent_intv_cnt' is about to reach the | |
758 | * 'abort_limit' value, otherwise false | |
759 | */ | |
760 | bool tipc_link_too_silent(struct tipc_link *l) | |
761 | { | |
762 | return (l->silent_intv_cnt + 2 > l->abort_limit); | |
763 | } | |
764 | ||
333ef69e JPM |
765 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
766 | */ | |
767 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
768 | { | |
c91522f8 YX |
769 | int mtyp = 0; |
770 | int rc = 0; | |
42b18f60 JPM |
771 | bool state = false; |
772 | bool probe = false; | |
773 | bool setup = false; | |
52666986 JPM |
774 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
775 | u16 bc_acked = l->bc_rcvlink->acked; | |
35c55c98 | 776 | struct tipc_mon_state *mstate = &l->mon_state; |
5045f7b9 | 777 | |
26574db0 TL |
778 | trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " "); |
779 | trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " "); | |
662921cd JPM |
780 | switch (l->state) { |
781 | case LINK_ESTABLISHED: | |
782 | case LINK_SYNCHING: | |
42b18f60 | 783 | mtyp = STATE_MSG; |
35c55c98 JPM |
784 | link_profile_stats(l); |
785 | tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); | |
786 | if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) | |
787 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
42b18f60 | 788 | state = bc_acked != bc_snt; |
35c55c98 JPM |
789 | state |= l->bc_rcvlink->rcv_unacked; |
790 | state |= l->rcv_unacked; | |
791 | state |= !skb_queue_empty(&l->transmq); | |
792 | state |= !skb_queue_empty(&l->deferdq); | |
793 | probe = mstate->probing; | |
794 | probe |= l->silent_intv_cnt; | |
795 | if (probe || mstate->monitoring) | |
796 | l->silent_intv_cnt++; | |
662921cd JPM |
797 | break; |
798 | case LINK_RESET: | |
42b18f60 JPM |
799 | setup = l->rst_cnt++ <= 4; |
800 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 801 | mtyp = RESET_MSG; |
662921cd JPM |
802 | break; |
803 | case LINK_ESTABLISHING: | |
42b18f60 | 804 | setup = true; |
5045f7b9 | 805 | mtyp = ACTIVATE_MSG; |
662921cd | 806 | break; |
662921cd | 807 | case LINK_PEER_RESET: |
598411d7 | 808 | case LINK_RESETTING: |
662921cd JPM |
809 | case LINK_FAILINGOVER: |
810 | break; | |
811 | default: | |
812 | break; | |
5045f7b9 | 813 | } |
662921cd | 814 | |
42b18f60 | 815 | if (state || probe || setup) |
8d6e79d3 | 816 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); |
5045f7b9 | 817 | |
333ef69e JPM |
818 | return rc; |
819 | } | |
820 | ||
b97bf3fd | 821 | /** |
3127a020 | 822 | * link_schedule_user - schedule a message sender for wakeup after congestion |
365ad353 JPM |
823 | * @l: congested link |
824 | * @hdr: header of message that is being sent | |
50100a5e | 825 | * Create pseudo msg to send back to user when congestion abates |
b97bf3fd | 826 | */ |
365ad353 | 827 | static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) |
b97bf3fd | 828 | { |
365ad353 JPM |
829 | u32 dnode = tipc_own_addr(l->net); |
830 | u32 dport = msg_origport(hdr); | |
3127a020 JPM |
831 | struct sk_buff *skb; |
832 | ||
3127a020 JPM |
833 | /* Create and schedule wakeup pseudo message */ |
834 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
365ad353 | 835 | dnode, l->addr, dport, 0, 0); |
3127a020 | 836 | if (!skb) |
22d85c79 | 837 | return -ENOBUFS; |
365ad353 JPM |
838 | msg_set_dest_droppable(buf_msg(skb), true); |
839 | TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); | |
840 | skb_queue_tail(&l->wakeupq, skb); | |
841 | l->stats.link_congs++; | |
26574db0 | 842 | trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!"); |
3127a020 | 843 | return -ELINKCONG; |
b97bf3fd PL |
844 | } |
845 | ||
50100a5e JPM |
846 | /** |
847 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
365ad353 JPM |
848 | * @l: congested link |
849 | * Wake up a number of waiting users, as permitted by available space | |
850 | * in the send queue | |
50100a5e | 851 | */ |
e064cce1 | 852 | static void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 853 | { |
7c5b4205 JM |
854 | struct sk_buff_head *wakeupq = &l->wakeupq; |
855 | struct sk_buff_head *inputq = l->inputq; | |
58d78b32 | 856 | struct sk_buff *skb, *tmp; |
7c5b4205 JM |
857 | struct sk_buff_head tmpq; |
858 | int avail[5] = {0,}; | |
859 | int imp = 0; | |
50100a5e | 860 | |
7c5b4205 JM |
861 | __skb_queue_head_init(&tmpq); |
862 | ||
863 | for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) | |
864 | avail[imp] = l->backlog[imp].limit - l->backlog[imp].len; | |
865 | ||
866 | skb_queue_walk_safe(wakeupq, skb, tmp) { | |
1f66d161 | 867 | imp = TIPC_SKB_CB(skb)->chain_imp; |
7c5b4205 JM |
868 | if (avail[imp] <= 0) |
869 | continue; | |
870 | avail[imp]--; | |
871 | __skb_unlink(skb, wakeupq); | |
872 | __skb_queue_tail(&tmpq, skb); | |
b97bf3fd | 873 | } |
7c5b4205 JM |
874 | |
875 | spin_lock_bh(&inputq->lock); | |
876 | skb_queue_splice_tail(&tmpq, inputq); | |
877 | spin_unlock_bh(&inputq->lock); | |
878 | ||
b97bf3fd PL |
879 | } |
880 | ||
6e498158 | 881 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 882 | { |
a1f8dd34 | 883 | struct sk_buff_head list; |
e95584a8 | 884 | u32 imp; |
a1f8dd34 YX |
885 | |
886 | __skb_queue_head_init(&list); | |
887 | ||
7ea817f4 | 888 | l->in_session = false; |
f7a93780 TL |
889 | /* Force re-synch of peer session number before establishing */ |
890 | l->peer_session--; | |
e74a386d | 891 | l->session++; |
6e498158 | 892 | l->mtu = l->advertised_mtu; |
a1f8dd34 | 893 | |
3f32d0be | 894 | spin_lock_bh(&l->wakeupq.lock); |
a1f8dd34 YX |
895 | skb_queue_splice_init(&l->wakeupq, &list); |
896 | spin_unlock_bh(&l->wakeupq.lock); | |
897 | ||
3f32d0be | 898 | spin_lock_bh(&l->inputq->lock); |
a1f8dd34 | 899 | skb_queue_splice_init(&list, l->inputq); |
3f32d0be | 900 | spin_unlock_bh(&l->inputq->lock); |
3f32d0be | 901 | |
6e498158 JPM |
902 | __skb_queue_purge(&l->transmq); |
903 | __skb_queue_purge(&l->deferdq); | |
2af5ae37 | 904 | __skb_queue_purge(&l->backlogq); |
58ee86b8 | 905 | __skb_queue_purge(&l->failover_deferdq); |
e95584a8 TL |
906 | for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) { |
907 | l->backlog[imp].len = 0; | |
908 | l->backlog[imp].target_bskb = NULL; | |
909 | } | |
6e498158 | 910 | kfree_skb(l->reasm_buf); |
2320bcda | 911 | kfree_skb(l->reasm_tnlmsg); |
6e498158 JPM |
912 | kfree_skb(l->failover_reasm_skb); |
913 | l->reasm_buf = NULL; | |
2320bcda | 914 | l->reasm_tnlmsg = NULL; |
6e498158 JPM |
915 | l->failover_reasm_skb = NULL; |
916 | l->rcv_unacked = 0; | |
917 | l->snd_nxt = 1; | |
918 | l->rcv_nxt = 1; | |
9012de50 JM |
919 | l->snd_nxt_state = 1; |
920 | l->rcv_nxt_state = 1; | |
c1ab3f1d | 921 | l->acked = 0; |
6e498158 | 922 | l->silent_intv_cnt = 0; |
88e8ac70 | 923 | l->rst_cnt = 0; |
52666986 | 924 | l->bc_peer_is_up = false; |
35c55c98 | 925 | memset(&l->mon_state, 0, sizeof(l->mon_state)); |
38206d59 | 926 | tipc_link_reset_stats(l); |
b97bf3fd PL |
927 | } |
928 | ||
af9b028e JPM |
929 | /** |
930 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
931 | * @link: link to use | |
932 | * @list: chain of buffers containing message | |
933 | * @xmitq: returned list of packets to be sent by caller | |
934 | * | |
365ad353 | 935 | * Consumes the buffer chain. |
af9b028e JPM |
936 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
937 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
938 | */ | |
939 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
940 | struct sk_buff_head *xmitq) | |
941 | { | |
942 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
06e7c70c TL |
943 | struct sk_buff_head *backlogq = &l->backlogq; |
944 | struct sk_buff_head *transmq = &l->transmq; | |
945 | struct sk_buff *skb, *_skb; | |
946 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; | |
af9b028e JPM |
947 | u16 ack = l->rcv_nxt - 1; |
948 | u16 seqno = l->snd_nxt; | |
95901122 | 949 | int pkt_cnt = skb_queue_len(list); |
06e7c70c TL |
950 | int imp = msg_importance(hdr); |
951 | unsigned int maxwin = l->window; | |
952 | unsigned int mtu = l->mtu; | |
953 | bool new_bundle; | |
365ad353 | 954 | int rc = 0; |
af9b028e | 955 | |
4952cd3e | 956 | if (unlikely(msg_size(hdr) > mtu)) { |
2320bcda TL |
957 | pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n", |
958 | skb_queue_len(list), msg_user(hdr), | |
959 | msg_type(hdr), msg_size(hdr), mtu); | |
e654f9f5 | 960 | __skb_queue_purge(list); |
af9b028e | 961 | return -EMSGSIZE; |
4952cd3e | 962 | } |
af9b028e | 963 | |
365ad353 JPM |
964 | /* Allow oversubscription of one data msg per source at congestion */ |
965 | if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { | |
966 | if (imp == TIPC_SYSTEM_IMPORTANCE) { | |
967 | pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); | |
968 | return -ENOBUFS; | |
969 | } | |
970 | rc = link_schedule_user(l, hdr); | |
971 | } | |
972 | ||
95901122 JPM |
973 | if (pkt_cnt > 1) { |
974 | l->stats.sent_fragmented++; | |
975 | l->stats.sent_fragments += pkt_cnt; | |
976 | } | |
977 | ||
af9b028e | 978 | /* Prepare each packet for sending, and add to relevant queue: */ |
06e7c70c | 979 | while ((skb = __skb_dequeue(list))) { |
af9b028e | 980 | if (likely(skb_queue_len(transmq) < maxwin)) { |
06e7c70c TL |
981 | hdr = buf_msg(skb); |
982 | msg_set_seqno(hdr, seqno); | |
983 | msg_set_ack(hdr, ack); | |
984 | msg_set_bcast_ack(hdr, bc_ack); | |
af9b028e | 985 | _skb = skb_clone(skb, GFP_ATOMIC); |
4952cd3e | 986 | if (!_skb) { |
06e7c70c | 987 | kfree_skb(skb); |
e654f9f5 | 988 | __skb_queue_purge(list); |
af9b028e | 989 | return -ENOBUFS; |
4952cd3e | 990 | } |
af9b028e | 991 | __skb_queue_tail(transmq, skb); |
05572271 HL |
992 | /* next retransmit attempt */ |
993 | if (link_is_bc_sndlink(l)) | |
53962bce | 994 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; |
af9b028e | 995 | __skb_queue_tail(xmitq, _skb); |
c1ab3f1d | 996 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e | 997 | l->rcv_unacked = 0; |
95901122 | 998 | l->stats.sent_pkts++; |
af9b028e JPM |
999 | seqno++; |
1000 | continue; | |
1001 | } | |
06e7c70c TL |
1002 | if (tipc_msg_try_bundle(l->backlog[imp].target_bskb, &skb, |
1003 | mtu - INT_H_SIZE, l->addr, | |
1004 | &new_bundle)) { | |
1005 | if (skb) { | |
1006 | /* Keep a ref. to the skb for next try */ | |
1007 | l->backlog[imp].target_bskb = skb; | |
1008 | l->backlog[imp].len++; | |
1009 | __skb_queue_tail(backlogq, skb); | |
1010 | } else { | |
1011 | if (new_bundle) { | |
1012 | l->stats.sent_bundles++; | |
1013 | l->stats.sent_bundled++; | |
1014 | } | |
1015 | l->stats.sent_bundled++; | |
1016 | } | |
af9b028e JPM |
1017 | continue; |
1018 | } | |
e95584a8 | 1019 | l->backlog[imp].target_bskb = NULL; |
06e7c70c TL |
1020 | l->backlog[imp].len += (1 + skb_queue_len(list)); |
1021 | __skb_queue_tail(backlogq, skb); | |
af9b028e JPM |
1022 | skb_queue_splice_tail_init(list, backlogq); |
1023 | } | |
1024 | l->snd_nxt = seqno; | |
365ad353 | 1025 | return rc; |
af9b028e JPM |
1026 | } |
1027 | ||
e064cce1 Y |
1028 | static void tipc_link_advance_backlog(struct tipc_link *l, |
1029 | struct sk_buff_head *xmitq) | |
d999297c JPM |
1030 | { |
1031 | struct sk_buff *skb, *_skb; | |
1032 | struct tipc_msg *hdr; | |
1033 | u16 seqno = l->snd_nxt; | |
1034 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 1035 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
e95584a8 | 1036 | u32 imp; |
d999297c JPM |
1037 | |
1038 | while (skb_queue_len(&l->transmq) < l->window) { | |
1039 | skb = skb_peek(&l->backlogq); | |
1040 | if (!skb) | |
1041 | break; | |
1042 | _skb = skb_clone(skb, GFP_ATOMIC); | |
1043 | if (!_skb) | |
1044 | break; | |
1045 | __skb_dequeue(&l->backlogq); | |
1046 | hdr = buf_msg(skb); | |
e95584a8 TL |
1047 | imp = msg_importance(hdr); |
1048 | l->backlog[imp].len--; | |
1049 | if (unlikely(skb == l->backlog[imp].target_bskb)) | |
1050 | l->backlog[imp].target_bskb = NULL; | |
d999297c | 1051 | __skb_queue_tail(&l->transmq, skb); |
05572271 HL |
1052 | /* next retransmit attempt */ |
1053 | if (link_is_bc_sndlink(l)) | |
53962bce | 1054 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; |
05572271 | 1055 | |
d999297c | 1056 | __skb_queue_tail(xmitq, _skb); |
c1ab3f1d | 1057 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 1058 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
1059 | msg_set_ack(hdr, ack); |
1060 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c | 1061 | l->rcv_unacked = 0; |
95901122 | 1062 | l->stats.sent_pkts++; |
d999297c JPM |
1063 | seqno++; |
1064 | } | |
1065 | l->snd_nxt = seqno; | |
1066 | } | |
1067 | ||
6a6b5c8b TL |
1068 | /** |
1069 | * link_retransmit_failure() - Detect repeated retransmit failures | |
1070 | * @l: tipc link sender | |
1071 | * @r: tipc link receiver (= l in case of unicast) | |
6a6b5c8b TL |
1072 | * @rc: returned code |
1073 | * | |
1074 | * Return: true if the repeated retransmit failures happens, otherwise | |
1075 | * false | |
1076 | */ | |
1077 | static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r, | |
71204231 | 1078 | int *rc) |
d356eeba | 1079 | { |
6a6b5c8b TL |
1080 | struct sk_buff *skb = skb_peek(&l->transmq); |
1081 | struct tipc_msg *hdr; | |
1082 | ||
1083 | if (!skb) | |
1084 | return false; | |
6a6b5c8b | 1085 | |
71204231 TL |
1086 | if (!TIPC_SKB_CB(skb)->retr_cnt) |
1087 | return false; | |
6a6b5c8b | 1088 | |
71204231 | 1089 | if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp + |
426071f1 | 1090 | msecs_to_jiffies(r->tolerance * 10))) |
71204231 TL |
1091 | return false; |
1092 | ||
1093 | hdr = buf_msg(skb); | |
1094 | if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr))) | |
1095 | return false; | |
6a6b5c8b | 1096 | |
71204231 TL |
1097 | pr_warn("Retransmission failure on link <%s>\n", l->name); |
1098 | link_print(l, "State of link "); | |
1099 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
1100 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
1101 | pr_info("sqno %u, prev: %x, dest: %x\n", | |
1102 | msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr)); | |
1103 | pr_info("retr_stamp %d, retr_cnt %d\n", | |
1104 | jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp), | |
1105 | TIPC_SKB_CB(skb)->retr_cnt); | |
1106 | ||
1107 | trace_tipc_list_dump(&l->transmq, true, "retrans failure!"); | |
1108 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!"); | |
1109 | trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!"); | |
1110 | ||
1111 | if (link_is_bc_sndlink(l)) { | |
1112 | r->state = LINK_RESET; | |
1113 | *rc = TIPC_LINK_DOWN_EVT; | |
1114 | } else { | |
6a6b5c8b | 1115 | *rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
6a6b5c8b | 1116 | } |
52666986 | 1117 | |
71204231 | 1118 | return true; |
d356eeba AS |
1119 | } |
1120 | ||
6a6b5c8b | 1121 | /* tipc_link_bc_retrans() - retransmit zero or more packets |
a4dc70d4 JM |
1122 | * @l: the link to transmit on |
1123 | * @r: the receiving link ordering the retransmit. Same as l if unicast | |
1124 | * @from: retransmit from (inclusive) this sequence number | |
1125 | * @to: retransmit to (inclusive) this sequence number | |
1126 | * xmitq: queue for accumulating the retransmitted packets | |
1127 | */ | |
6a6b5c8b TL |
1128 | static int tipc_link_bc_retrans(struct tipc_link *l, struct tipc_link *r, |
1129 | u16 from, u16 to, struct sk_buff_head *xmitq) | |
d999297c JPM |
1130 | { |
1131 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
52666986 | 1132 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
a4dc70d4 JM |
1133 | u16 ack = l->rcv_nxt - 1; |
1134 | struct tipc_msg *hdr; | |
6a6b5c8b | 1135 | int rc = 0; |
d999297c JPM |
1136 | |
1137 | if (!skb) | |
1138 | return 0; | |
31c4f4cc LDC |
1139 | if (less(to, from)) |
1140 | return 0; | |
d999297c | 1141 | |
26574db0 | 1142 | trace_tipc_link_retrans(r, from, to, &l->transmq); |
6a6b5c8b | 1143 | |
71204231 | 1144 | if (link_retransmit_failure(l, r, &rc)) |
6a6b5c8b | 1145 | return rc; |
c1ab3f1d | 1146 | |
d999297c | 1147 | skb_queue_walk(&l->transmq, skb) { |
d999297c | 1148 | hdr = buf_msg(skb); |
a4dc70d4 JM |
1149 | if (less(msg_seqno(hdr), from)) |
1150 | continue; | |
1151 | if (more(msg_seqno(hdr), to)) | |
1152 | break; | |
71204231 TL |
1153 | |
1154 | if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) | |
1155 | continue; | |
1156 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; | |
20c67312 | 1157 | _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE, GFP_ATOMIC); |
d999297c JPM |
1158 | if (!_skb) |
1159 | return 0; | |
1160 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
1161 | msg_set_ack(hdr, ack); |
1162 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
1163 | _skb->priority = TC_PRIO_CONTROL; |
1164 | __skb_queue_tail(xmitq, _skb); | |
d999297c | 1165 | l->stats.retransmitted++; |
71204231 TL |
1166 | |
1167 | /* Increase actual retrans counter & mark first time */ | |
1168 | if (!TIPC_SKB_CB(skb)->retr_cnt++) | |
1169 | TIPC_SKB_CB(skb)->retr_stamp = jiffies; | |
d999297c JPM |
1170 | } |
1171 | return 0; | |
1172 | } | |
1173 | ||
c637c103 | 1174 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1175 | * |
c637c103 | 1176 | * Consumes buffer if message is of right type |
7ae934be EH |
1177 | * Node lock must be held |
1178 | */ | |
52666986 | 1179 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1180 | struct sk_buff_head *inputq) |
7ae934be | 1181 | { |
399574d4 | 1182 | struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; |
a853e4c6 JPM |
1183 | struct tipc_msg *hdr = buf_msg(skb); |
1184 | ||
1185 | switch (msg_user(hdr)) { | |
c637c103 JPM |
1186 | case TIPC_LOW_IMPORTANCE: |
1187 | case TIPC_MEDIUM_IMPORTANCE: | |
1188 | case TIPC_HIGH_IMPORTANCE: | |
1189 | case TIPC_CRITICAL_IMPORTANCE: | |
2f487712 | 1190 | if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { |
399574d4 | 1191 | skb_queue_tail(mc_inputq, skb); |
a853e4c6 JPM |
1192 | return true; |
1193 | } | |
f79e3365 | 1194 | /* fall through */ |
2f487712 | 1195 | case CONN_MANAGER: |
36c0a9df | 1196 | skb_queue_tail(inputq, skb); |
c637c103 | 1197 | return true; |
399574d4 JM |
1198 | case GROUP_PROTOCOL: |
1199 | skb_queue_tail(mc_inputq, skb); | |
1200 | return true; | |
7ae934be | 1201 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1202 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1203 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1204 | return true; |
1205 | case MSG_BUNDLER: | |
dff29b1a | 1206 | case TUNNEL_PROTOCOL: |
c637c103 | 1207 | case MSG_FRAGMENTER: |
7ae934be | 1208 | case BCAST_PROTOCOL: |
c637c103 | 1209 | return false; |
7ae934be | 1210 | default: |
c637c103 JPM |
1211 | pr_warn("Dropping received illegal msg type\n"); |
1212 | kfree_skb(skb); | |
7384b538 | 1213 | return true; |
c637c103 | 1214 | }; |
7ae934be | 1215 | } |
c637c103 JPM |
1216 | |
1217 | /* tipc_link_input - process packet that has passed link protocol check | |
1218 | * | |
1219 | * Consumes buffer | |
7ae934be | 1220 | */ |
9073fb8b | 1221 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
58ee86b8 TL |
1222 | struct sk_buff_head *inputq, |
1223 | struct sk_buff **reasm_skb) | |
7ae934be | 1224 | { |
6e498158 | 1225 | struct tipc_msg *hdr = buf_msg(skb); |
c637c103 | 1226 | struct sk_buff *iskb; |
9945e804 | 1227 | struct sk_buff_head tmpq; |
6e498158 | 1228 | int usr = msg_user(hdr); |
6e498158 | 1229 | int pos = 0; |
c637c103 | 1230 | |
6e498158 | 1231 | if (usr == MSG_BUNDLER) { |
9945e804 | 1232 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1233 | l->stats.recv_bundles++; |
1234 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1235 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1236 | tipc_data_input(l, iskb, &tmpq); |
1237 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1238 | return 0; |
6e498158 JPM |
1239 | } else if (usr == MSG_FRAGMENTER) { |
1240 | l->stats.recv_fragments++; | |
1241 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1242 | l->stats.recv_fragmented++; | |
9073fb8b | 1243 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1244 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1245 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1246 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1247 | } |
662921cd | 1248 | return 0; |
6e498158 | 1249 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1250 | tipc_bcast_lock(l->net); |
52666986 | 1251 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1252 | tipc_bcast_unlock(l->net); |
6e498158 | 1253 | } |
58ee86b8 | 1254 | |
6e498158 | 1255 | kfree_skb(skb); |
662921cd | 1256 | return 0; |
7ae934be EH |
1257 | } |
1258 | ||
58ee86b8 TL |
1259 | /* tipc_link_tnl_rcv() - receive TUNNEL_PROTOCOL message, drop or process the |
1260 | * inner message along with the ones in the old link's | |
1261 | * deferdq | |
1262 | * @l: tunnel link | |
1263 | * @skb: TUNNEL_PROTOCOL message | |
1264 | * @inputq: queue to put messages ready for delivery | |
1265 | */ | |
1266 | static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1267 | struct sk_buff_head *inputq) | |
1268 | { | |
1269 | struct sk_buff **reasm_skb = &l->failover_reasm_skb; | |
2320bcda | 1270 | struct sk_buff **reasm_tnlmsg = &l->reasm_tnlmsg; |
58ee86b8 TL |
1271 | struct sk_buff_head *fdefq = &l->failover_deferdq; |
1272 | struct tipc_msg *hdr = buf_msg(skb); | |
1273 | struct sk_buff *iskb; | |
1274 | int ipos = 0; | |
1275 | int rc = 0; | |
1276 | u16 seqno; | |
1277 | ||
2320bcda TL |
1278 | if (msg_type(hdr) == SYNCH_MSG) { |
1279 | kfree_skb(skb); | |
1280 | return 0; | |
1281 | } | |
58ee86b8 | 1282 | |
2320bcda TL |
1283 | /* Not a fragment? */ |
1284 | if (likely(!msg_nof_fragms(hdr))) { | |
1285 | if (unlikely(!tipc_msg_extract(skb, &iskb, &ipos))) { | |
1286 | pr_warn_ratelimited("Unable to extract msg, defq: %d\n", | |
1287 | skb_queue_len(fdefq)); | |
1288 | return 0; | |
1289 | } | |
1290 | kfree_skb(skb); | |
1291 | } else { | |
1292 | /* Set fragment type for buf_append */ | |
1293 | if (msg_fragm_no(hdr) == 1) | |
1294 | msg_set_type(hdr, FIRST_FRAGMENT); | |
1295 | else if (msg_fragm_no(hdr) < msg_nof_fragms(hdr)) | |
1296 | msg_set_type(hdr, FRAGMENT); | |
1297 | else | |
1298 | msg_set_type(hdr, LAST_FRAGMENT); | |
1299 | ||
1300 | if (!tipc_buf_append(reasm_tnlmsg, &skb)) { | |
1301 | /* Successful but non-complete reassembly? */ | |
1302 | if (*reasm_tnlmsg || link_is_bc_rcvlink(l)) | |
1303 | return 0; | |
1304 | pr_warn_ratelimited("Unable to reassemble tunnel msg\n"); | |
1305 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1306 | } | |
1307 | iskb = skb; | |
58ee86b8 TL |
1308 | } |
1309 | ||
1310 | do { | |
1311 | seqno = buf_seqno(iskb); | |
58ee86b8 TL |
1312 | if (unlikely(less(seqno, l->drop_point))) { |
1313 | kfree_skb(iskb); | |
1314 | continue; | |
1315 | } | |
58ee86b8 TL |
1316 | if (unlikely(seqno != l->drop_point)) { |
1317 | __tipc_skb_queue_sorted(fdefq, seqno, iskb); | |
1318 | continue; | |
1319 | } | |
1320 | ||
1321 | l->drop_point++; | |
58ee86b8 TL |
1322 | if (!tipc_data_input(l, iskb, inputq)) |
1323 | rc |= tipc_link_input(l, iskb, inputq, reasm_skb); | |
1324 | if (unlikely(rc)) | |
1325 | break; | |
1326 | } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point))); | |
1327 | ||
58ee86b8 TL |
1328 | return rc; |
1329 | } | |
1330 | ||
d999297c JPM |
1331 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1332 | { | |
1333 | bool released = false; | |
1334 | struct sk_buff *skb, *tmp; | |
1335 | ||
1336 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1337 | if (more(buf_seqno(skb), acked)) | |
1338 | break; | |
1339 | __skb_unlink(skb, &l->transmq); | |
1340 | kfree_skb(skb); | |
1341 | released = true; | |
1342 | } | |
1343 | return released; | |
1344 | } | |
1345 | ||
9195948f TL |
1346 | /* tipc_build_gap_ack_blks - build Gap ACK blocks |
1347 | * @l: tipc link that data have come with gaps in sequence if any | |
1348 | * @data: data buffer to store the Gap ACK blocks after built | |
1349 | * | |
1350 | * returns the actual allocated memory size | |
1351 | */ | |
1352 | static u16 tipc_build_gap_ack_blks(struct tipc_link *l, void *data) | |
1353 | { | |
1354 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
1355 | struct tipc_gap_ack_blks *ga = data; | |
1356 | u16 len, expect, seqno = 0; | |
1357 | u8 n = 0; | |
1358 | ||
1359 | if (!skb) | |
1360 | goto exit; | |
1361 | ||
1362 | expect = buf_seqno(skb); | |
1363 | skb_queue_walk(&l->deferdq, skb) { | |
1364 | seqno = buf_seqno(skb); | |
1365 | if (unlikely(more(seqno, expect))) { | |
1366 | ga->gacks[n].ack = htons(expect - 1); | |
1367 | ga->gacks[n].gap = htons(seqno - expect); | |
1368 | if (++n >= MAX_GAP_ACK_BLKS) { | |
1369 | pr_info_ratelimited("Too few Gap ACK blocks!\n"); | |
1370 | goto exit; | |
1371 | } | |
1372 | } else if (unlikely(less(seqno, expect))) { | |
1373 | pr_warn("Unexpected skb in deferdq!\n"); | |
1374 | continue; | |
1375 | } | |
1376 | expect = seqno + 1; | |
1377 | } | |
1378 | ||
1379 | /* last block */ | |
1380 | ga->gacks[n].ack = htons(seqno); | |
1381 | ga->gacks[n].gap = 0; | |
1382 | n++; | |
1383 | ||
1384 | exit: | |
1385 | len = tipc_gap_ack_blks_sz(n); | |
1386 | ga->len = htons(len); | |
1387 | ga->gack_cnt = n; | |
1388 | return len; | |
1389 | } | |
1390 | ||
1391 | /* tipc_link_advance_transmq - advance TIPC link transmq queue by releasing | |
1392 | * acked packets, also doing retransmissions if | |
1393 | * gaps found | |
1394 | * @l: tipc link with transmq queue to be advanced | |
1395 | * @acked: seqno of last packet acked by peer without any gaps before | |
1396 | * @gap: # of gap packets | |
1397 | * @ga: buffer pointer to Gap ACK blocks from peer | |
1398 | * @xmitq: queue for accumulating the retransmitted packets if any | |
6a6b5c8b TL |
1399 | * |
1400 | * In case of a repeated retransmit failures, the call will return shortly | |
1401 | * with a returned code (e.g. TIPC_LINK_DOWN_EVT) | |
9195948f | 1402 | */ |
6a6b5c8b TL |
1403 | static int tipc_link_advance_transmq(struct tipc_link *l, u16 acked, u16 gap, |
1404 | struct tipc_gap_ack_blks *ga, | |
1405 | struct sk_buff_head *xmitq) | |
9195948f TL |
1406 | { |
1407 | struct sk_buff *skb, *_skb, *tmp; | |
1408 | struct tipc_msg *hdr; | |
1409 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; | |
1410 | u16 ack = l->rcv_nxt - 1; | |
71204231 | 1411 | bool passed = false; |
6a6b5c8b TL |
1412 | u16 seqno, n = 0; |
1413 | int rc = 0; | |
1414 | ||
9195948f TL |
1415 | skb_queue_walk_safe(&l->transmq, skb, tmp) { |
1416 | seqno = buf_seqno(skb); | |
1417 | ||
1418 | next_gap_ack: | |
1419 | if (less_eq(seqno, acked)) { | |
1420 | /* release skb */ | |
1421 | __skb_unlink(skb, &l->transmq); | |
1422 | kfree_skb(skb); | |
1423 | } else if (less_eq(seqno, acked + gap)) { | |
71204231 TL |
1424 | /* First, check if repeated retrans failures occurs? */ |
1425 | if (!passed && link_retransmit_failure(l, l, &rc)) | |
1426 | return rc; | |
1427 | passed = true; | |
1428 | ||
1429 | /* retransmit skb if unrestricted*/ | |
382f598f TL |
1430 | if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) |
1431 | continue; | |
1432 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME; | |
71204231 TL |
1433 | _skb = __pskb_copy(skb, LL_MAX_HEADER + MIN_H_SIZE, |
1434 | GFP_ATOMIC); | |
9195948f TL |
1435 | if (!_skb) |
1436 | continue; | |
1437 | hdr = buf_msg(_skb); | |
1438 | msg_set_ack(hdr, ack); | |
1439 | msg_set_bcast_ack(hdr, bc_ack); | |
1440 | _skb->priority = TC_PRIO_CONTROL; | |
1441 | __skb_queue_tail(xmitq, _skb); | |
1442 | l->stats.retransmitted++; | |
71204231 TL |
1443 | |
1444 | /* Increase actual retrans counter & mark first time */ | |
1445 | if (!TIPC_SKB_CB(skb)->retr_cnt++) | |
1446 | TIPC_SKB_CB(skb)->retr_stamp = jiffies; | |
9195948f TL |
1447 | } else { |
1448 | /* retry with Gap ACK blocks if any */ | |
1449 | if (!ga || n >= ga->gack_cnt) | |
1450 | break; | |
1451 | acked = ntohs(ga->gacks[n].ack); | |
1452 | gap = ntohs(ga->gacks[n].gap); | |
1453 | n++; | |
1454 | goto next_gap_ack; | |
1455 | } | |
1456 | } | |
6a6b5c8b TL |
1457 | |
1458 | return 0; | |
9195948f TL |
1459 | } |
1460 | ||
34b9cd64 | 1461 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1462 | * |
1463 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1464 | * risk of ack storms towards the sender | |
f9aa358a | 1465 | */ |
34b9cd64 | 1466 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1467 | { |
52666986 JPM |
1468 | if (!l) |
1469 | return 0; | |
1470 | ||
1471 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1472 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1473 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1474 | return 0; |
1475 | l->rcv_unacked = 0; | |
02d11ca2 JPM |
1476 | |
1477 | /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ | |
1478 | l->snd_nxt = l->rcv_nxt; | |
1479 | return TIPC_LINK_SND_STATE; | |
52666986 JPM |
1480 | } |
1481 | ||
1482 | /* Unicast ACK */ | |
f9aa358a JPM |
1483 | l->rcv_unacked = 0; |
1484 | l->stats.sent_acks++; | |
8d6e79d3 | 1485 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
52666986 | 1486 | return 0; |
f9aa358a JPM |
1487 | } |
1488 | ||
282b3a05 JPM |
1489 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1490 | */ | |
1491 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1492 | { | |
1493 | int mtyp = RESET_MSG; | |
634696b1 | 1494 | struct sk_buff *skb; |
282b3a05 JPM |
1495 | |
1496 | if (l->state == LINK_ESTABLISHING) | |
1497 | mtyp = ACTIVATE_MSG; | |
1498 | ||
8d6e79d3 | 1499 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); |
634696b1 JPM |
1500 | |
1501 | /* Inform peer that this endpoint is going down if applicable */ | |
1502 | skb = skb_peek_tail(xmitq); | |
1503 | if (skb && (l->state == LINK_RESET)) | |
1504 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1505 | } |
1506 | ||
f9aa358a | 1507 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
e0a05ebe JPM |
1508 | * Note that sending of broadcast NACK is coordinated among nodes, to |
1509 | * reduce the risk of NACK storms towards the sender | |
f9aa358a | 1510 | */ |
e0a05ebe JPM |
1511 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
1512 | struct sk_buff_head *xmitq) | |
f9aa358a JPM |
1513 | { |
1514 | u32 def_cnt = ++l->stats.deferred_recv; | |
382f598f | 1515 | u32 defq_len = skb_queue_len(&l->deferdq); |
e0a05ebe | 1516 | int match1, match2; |
f9aa358a | 1517 | |
e0a05ebe JPM |
1518 | if (link_is_bc_rcvlink(l)) { |
1519 | match1 = def_cnt & 0xf; | |
1520 | match2 = tipc_own_addr(l->net) & 0xf; | |
1521 | if (match1 == match2) | |
1522 | return TIPC_LINK_SND_STATE; | |
1523 | return 0; | |
1524 | } | |
52666986 | 1525 | |
382f598f | 1526 | if (defq_len >= 3 && !((defq_len - 3) % 16)) |
8d6e79d3 | 1527 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
e0a05ebe | 1528 | return 0; |
f9aa358a JPM |
1529 | } |
1530 | ||
d999297c | 1531 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1532 | * @l: the link that should handle the message |
d999297c JPM |
1533 | * @skb: TIPC packet |
1534 | * @xmitq: queue to place packets to be sent after this call | |
1535 | */ | |
1536 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1537 | struct sk_buff_head *xmitq) | |
1538 | { | |
f9aa358a | 1539 | struct sk_buff_head *defq = &l->deferdq; |
382f598f | 1540 | struct tipc_msg *hdr = buf_msg(skb); |
81204c49 | 1541 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1542 | int rc = 0; |
1543 | ||
382f598f TL |
1544 | /* Verify and update link state */ |
1545 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) | |
1546 | return tipc_link_proto_rcv(l, skb, xmitq); | |
1547 | ||
1548 | /* Don't send probe at next timeout expiration */ | |
1549 | l->silent_intv_cnt = 0; | |
1550 | ||
f9aa358a | 1551 | do { |
d999297c | 1552 | hdr = buf_msg(skb); |
f9aa358a JPM |
1553 | seqno = msg_seqno(hdr); |
1554 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1555 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c | 1556 | |
662921cd | 1557 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1558 | if (l->state == LINK_ESTABLISHING) |
1559 | rc = TIPC_LINK_UP_EVT; | |
1560 | goto drop; | |
d999297c JPM |
1561 | } |
1562 | ||
81204c49 JPM |
1563 | /* Drop if outside receive window */ |
1564 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1565 | l->stats.duplicates++; | |
1566 | goto drop; | |
1567 | } | |
1568 | ||
d999297c JPM |
1569 | /* Forward queues and wake up waiting users */ |
1570 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1571 | tipc_link_advance_backlog(l, xmitq); | |
1572 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1573 | link_prepare_wakeup(l); | |
1574 | } | |
1575 | ||
81204c49 JPM |
1576 | /* Defer delivery if sequence gap */ |
1577 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1578 | __tipc_skb_queue_sorted(defq, seqno, skb); |
e0a05ebe | 1579 | rc |= tipc_link_build_nack_msg(l, xmitq); |
f9aa358a | 1580 | break; |
d999297c JPM |
1581 | } |
1582 | ||
81204c49 | 1583 | /* Deliver packet */ |
d999297c | 1584 | l->rcv_nxt++; |
95901122 | 1585 | l->stats.recv_pkts++; |
58ee86b8 TL |
1586 | |
1587 | if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL)) | |
1588 | rc |= tipc_link_tnl_rcv(l, skb, l->inputq); | |
1589 | else if (!tipc_data_input(l, skb, l->inputq)) | |
1590 | rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf); | |
f9aa358a | 1591 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1592 | rc |= tipc_link_build_state_msg(l, xmitq); |
02d11ca2 | 1593 | if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
52666986 | 1594 | break; |
382f598f | 1595 | } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt))); |
f9aa358a JPM |
1596 | |
1597 | return rc; | |
1598 | drop: | |
1599 | kfree_skb(skb); | |
d999297c JPM |
1600 | return rc; |
1601 | } | |
1602 | ||
426cc2b8 | 1603 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
1604 | bool probe_reply, u16 rcvgap, |
1605 | int tolerance, int priority, | |
426cc2b8 JPM |
1606 | struct sk_buff_head *xmitq) |
1607 | { | |
02d11ca2 | 1608 | struct tipc_link *bcl = l->bc_rcvlink; |
e74a386d JPM |
1609 | struct sk_buff *skb; |
1610 | struct tipc_msg *hdr; | |
1611 | struct sk_buff_head *dfq = &l->deferdq; | |
02d11ca2 | 1612 | bool node_up = link_is_up(bcl); |
35c55c98 JPM |
1613 | struct tipc_mon_state *mstate = &l->mon_state; |
1614 | int dlen = 0; | |
1615 | void *data; | |
9195948f | 1616 | u16 glen = 0; |
426cc2b8 JPM |
1617 | |
1618 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1619 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1620 | return; |
1621 | ||
e74a386d JPM |
1622 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1623 | return; | |
1624 | ||
1625 | if (!skb_queue_empty(dfq)) | |
1626 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1627 | ||
1628 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
9195948f TL |
1629 | tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ, |
1630 | l->addr, tipc_own_addr(l->net), 0, 0, 0); | |
e74a386d JPM |
1631 | if (!skb) |
1632 | return; | |
1633 | ||
1634 | hdr = buf_msg(skb); | |
35c55c98 | 1635 | data = msg_data(hdr); |
e74a386d JPM |
1636 | msg_set_session(hdr, l->session); |
1637 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1638 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1639 | msg_set_next_sent(hdr, l->snd_nxt); |
1640 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
02d11ca2 | 1641 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
06bd2b1e | 1642 | msg_set_bc_ack_invalid(hdr, !node_up); |
52666986 | 1643 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
426cc2b8 JPM |
1644 | msg_set_link_tolerance(hdr, tolerance); |
1645 | msg_set_linkprio(hdr, priority); | |
1646 | msg_set_redundant_link(hdr, node_up); | |
1647 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1648 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1649 | |
1650 | if (mtyp == STATE_MSG) { | |
9012de50 JM |
1651 | if (l->peer_caps & TIPC_LINK_PROTO_SEQNO) |
1652 | msg_set_seqno(hdr, l->snd_nxt_state++); | |
e74a386d | 1653 | msg_set_seq_gap(hdr, rcvgap); |
02d11ca2 | 1654 | msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); |
426cc2b8 | 1655 | msg_set_probe(hdr, probe); |
8d6e79d3 | 1656 | msg_set_is_keepalive(hdr, probe || probe_reply); |
9195948f TL |
1657 | if (l->peer_caps & TIPC_GAP_ACK_BLOCK) |
1658 | glen = tipc_build_gap_ack_blks(l, data); | |
1659 | tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id); | |
1660 | msg_set_size(hdr, INT_H_SIZE + glen + dlen); | |
1661 | skb_trim(skb, INT_H_SIZE + glen + dlen); | |
426cc2b8 | 1662 | l->stats.sent_states++; |
52666986 | 1663 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1664 | } else { |
1665 | /* RESET_MSG or ACTIVATE_MSG */ | |
91986ee1 TL |
1666 | if (mtyp == ACTIVATE_MSG) { |
1667 | msg_set_dest_session_valid(hdr, 1); | |
1668 | msg_set_dest_session(hdr, l->peer_session); | |
1669 | } | |
426cc2b8 | 1670 | msg_set_max_pkt(hdr, l->advertised_mtu); |
35c55c98 JPM |
1671 | strcpy(data, l->if_name); |
1672 | msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
1673 | skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
426cc2b8 | 1674 | } |
e74a386d JPM |
1675 | if (probe) |
1676 | l->stats.sent_probes++; | |
1677 | if (rcvgap) | |
1678 | l->stats.sent_nacks++; | |
426cc2b8 | 1679 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1680 | __skb_queue_tail(xmitq, skb); |
26574db0 | 1681 | trace_tipc_proto_build(skb, false, l->name); |
b97bf3fd PL |
1682 | } |
1683 | ||
c140eb16 LDC |
1684 | void tipc_link_create_dummy_tnl_msg(struct tipc_link *l, |
1685 | struct sk_buff_head *xmitq) | |
1686 | { | |
1687 | u32 onode = tipc_own_addr(l->net); | |
1688 | struct tipc_msg *hdr, *ihdr; | |
1689 | struct sk_buff_head tnlq; | |
1690 | struct sk_buff *skb; | |
1691 | u32 dnode = l->addr; | |
1692 | ||
e654f9f5 | 1693 | __skb_queue_head_init(&tnlq); |
c140eb16 LDC |
1694 | skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG, |
1695 | INT_H_SIZE, BASIC_H_SIZE, | |
1696 | dnode, onode, 0, 0, 0); | |
1697 | if (!skb) { | |
1698 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
1699 | return; | |
1700 | } | |
1701 | ||
1702 | hdr = buf_msg(skb); | |
1703 | msg_set_msgcnt(hdr, 1); | |
1704 | msg_set_bearer_id(hdr, l->peer_bearer_id); | |
1705 | ||
1706 | ihdr = (struct tipc_msg *)msg_data(hdr); | |
1707 | tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1708 | BASIC_H_SIZE, dnode); | |
1709 | msg_set_errcode(ihdr, TIPC_ERR_NO_PORT); | |
1710 | __skb_queue_tail(&tnlq, skb); | |
1711 | tipc_link_xmit(l, &tnlq, xmitq); | |
1712 | } | |
1713 | ||
6e498158 | 1714 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1715 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1716 | */ |
6e498158 JPM |
1717 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1718 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1719 | { |
58ee86b8 | 1720 | struct sk_buff_head *fdefq = &tnl->failover_deferdq; |
6e498158 JPM |
1721 | struct sk_buff *skb, *tnlskb; |
1722 | struct tipc_msg *hdr, tnlhdr; | |
1723 | struct sk_buff_head *queue = &l->transmq; | |
2320bcda | 1724 | struct sk_buff_head tmpxq, tnlq, frags; |
6e498158 | 1725 | u16 pktlen, pktcnt, seqno = l->snd_nxt; |
2320bcda | 1726 | bool pktcnt_need_update = false; |
4929a932 | 1727 | u16 syncpt; |
2320bcda | 1728 | int rc; |
b97bf3fd | 1729 | |
6e498158 | 1730 | if (!tnl) |
b97bf3fd PL |
1731 | return; |
1732 | ||
e654f9f5 | 1733 | __skb_queue_head_init(&tnlq); |
4929a932 TL |
1734 | /* Link Synching: |
1735 | * From now on, send only one single ("dummy") SYNCH message | |
1736 | * to peer. The SYNCH message does not contain any data, just | |
1737 | * a header conveying the synch point to the peer. | |
1738 | */ | |
1739 | if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { | |
1740 | tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG, | |
1741 | INT_H_SIZE, 0, l->addr, | |
1742 | tipc_own_addr(l->net), | |
1743 | 0, 0, 0); | |
1744 | if (!tnlskb) { | |
1745 | pr_warn("%sunable to create dummy SYNCH_MSG\n", | |
1746 | link_co_err); | |
1747 | return; | |
1748 | } | |
1749 | ||
1750 | hdr = buf_msg(tnlskb); | |
1751 | syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1; | |
1752 | msg_set_syncpt(hdr, syncpt); | |
1753 | msg_set_bearer_id(hdr, l->peer_bearer_id); | |
1754 | __skb_queue_tail(&tnlq, tnlskb); | |
1755 | tipc_link_xmit(tnl, &tnlq, xmitq); | |
1756 | return; | |
1757 | } | |
1758 | ||
d0d605c5 TL |
1759 | __skb_queue_head_init(&tmpxq); |
1760 | __skb_queue_head_init(&frags); | |
1761 | /* At least one packet required for safe algorithm => add dummy */ | |
1762 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1763 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), | |
1764 | 0, 0, TIPC_ERR_NO_PORT); | |
1765 | if (!skb) { | |
1766 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
1767 | return; | |
1768 | } | |
1769 | __skb_queue_tail(&tnlq, skb); | |
1770 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1771 | __skb_queue_purge(&tmpxq); | |
1772 | ||
6e498158 | 1773 | /* Initialize reusable tunnel packet header */ |
e74a386d | 1774 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 | 1775 | mtyp, INT_H_SIZE, l->addr); |
58ee86b8 TL |
1776 | if (mtyp == SYNCH_MSG) |
1777 | pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq)); | |
1778 | else | |
1779 | pktcnt = skb_queue_len(&l->transmq); | |
1780 | pktcnt += skb_queue_len(&l->backlogq); | |
6e498158 JPM |
1781 | msg_set_msgcnt(&tnlhdr, pktcnt); |
1782 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1783 | tnl: | |
1784 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1785 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1786 | hdr = buf_msg(skb); |
1787 | if (queue == &l->backlogq) | |
1788 | msg_set_seqno(hdr, seqno++); | |
1789 | pktlen = msg_size(hdr); | |
2320bcda TL |
1790 | |
1791 | /* Tunnel link MTU is not large enough? This could be | |
1792 | * due to: | |
1793 | * 1) Link MTU has just changed or set differently; | |
1794 | * 2) Or FAILOVER on the top of a SYNCH message | |
1795 | * | |
1796 | * The 2nd case should not happen if peer supports | |
1797 | * TIPC_TUNNEL_ENHANCED | |
1798 | */ | |
1799 | if (pktlen > tnl->mtu - INT_H_SIZE) { | |
1800 | if (mtyp == FAILOVER_MSG && | |
1801 | (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { | |
1802 | rc = tipc_msg_fragment(skb, &tnlhdr, tnl->mtu, | |
1803 | &frags); | |
1804 | if (rc) { | |
1805 | pr_warn("%sunable to frag msg: rc %d\n", | |
1806 | link_co_err, rc); | |
1807 | return; | |
1808 | } | |
1809 | pktcnt += skb_queue_len(&frags) - 1; | |
1810 | pktcnt_need_update = true; | |
1811 | skb_queue_splice_tail_init(&frags, &tnlq); | |
1812 | continue; | |
1813 | } | |
1814 | /* Unluckily, peer doesn't have TIPC_TUNNEL_ENHANCED | |
1815 | * => Just warn it and return! | |
1816 | */ | |
1817 | pr_warn_ratelimited("%stoo large msg <%d, %d>: %d!\n", | |
1818 | link_co_err, msg_user(hdr), | |
1819 | msg_type(hdr), msg_size(hdr)); | |
1820 | return; | |
1821 | } | |
1822 | ||
6e498158 | 1823 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); |
57d5f64d | 1824 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC); |
6e498158 JPM |
1825 | if (!tnlskb) { |
1826 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1827 | return; |
1828 | } | |
6e498158 JPM |
1829 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1830 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1831 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1832 | } |
6e498158 JPM |
1833 | if (queue != &l->backlogq) { |
1834 | queue = &l->backlogq; | |
1835 | goto tnl; | |
f006c9c7 | 1836 | } |
1dab3d5a | 1837 | |
2320bcda TL |
1838 | if (pktcnt_need_update) |
1839 | skb_queue_walk(&tnlq, skb) { | |
1840 | hdr = buf_msg(skb); | |
1841 | msg_set_msgcnt(hdr, pktcnt); | |
1842 | } | |
1843 | ||
6e498158 | 1844 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1845 | |
6e498158 JPM |
1846 | if (mtyp == FAILOVER_MSG) { |
1847 | tnl->drop_point = l->rcv_nxt; | |
1848 | tnl->failover_reasm_skb = l->reasm_buf; | |
1849 | l->reasm_buf = NULL; | |
58ee86b8 TL |
1850 | |
1851 | /* Failover the link's deferdq */ | |
1852 | if (unlikely(!skb_queue_empty(fdefq))) { | |
1853 | pr_warn("Link failover deferdq not empty: %d!\n", | |
1854 | skb_queue_len(fdefq)); | |
1855 | __skb_queue_purge(fdefq); | |
1856 | } | |
1857 | skb_queue_splice_init(&l->deferdq, fdefq); | |
2da71425 | 1858 | } |
b97bf3fd PL |
1859 | } |
1860 | ||
c0b14a08 TL |
1861 | /** |
1862 | * tipc_link_failover_prepare() - prepare tnl for link failover | |
1863 | * | |
1864 | * This is a special version of the precursor - tipc_link_tnl_prepare(), | |
1865 | * see the tipc_node_link_failover() for details | |
1866 | * | |
1867 | * @l: failover link | |
1868 | * @tnl: tunnel link | |
1869 | * @xmitq: queue for messages to be xmited | |
1870 | */ | |
1871 | void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl, | |
1872 | struct sk_buff_head *xmitq) | |
1873 | { | |
1874 | struct sk_buff_head *fdefq = &tnl->failover_deferdq; | |
1875 | ||
1876 | tipc_link_create_dummy_tnl_msg(tnl, xmitq); | |
1877 | ||
8ebed8ae | 1878 | /* This failover link endpoint was never established before, |
c0b14a08 TL |
1879 | * so it has not received anything from peer. |
1880 | * Otherwise, it must be a normal failover situation or the | |
1881 | * node has entered SELF_DOWN_PEER_LEAVING and both peer nodes | |
1882 | * would have to start over from scratch instead. | |
1883 | */ | |
c0b14a08 TL |
1884 | tnl->drop_point = 1; |
1885 | tnl->failover_reasm_skb = NULL; | |
1886 | ||
1887 | /* Initiate the link's failover deferdq */ | |
1888 | if (unlikely(!skb_queue_empty(fdefq))) { | |
1889 | pr_warn("Link failover deferdq not empty: %d!\n", | |
1890 | skb_queue_len(fdefq)); | |
1891 | __skb_queue_purge(fdefq); | |
1892 | } | |
1893 | } | |
1894 | ||
7ea817f4 JM |
1895 | /* tipc_link_validate_msg(): validate message against current link state |
1896 | * Returns true if message should be accepted, otherwise false | |
1897 | */ | |
1898 | bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr) | |
1899 | { | |
1900 | u16 curr_session = l->peer_session; | |
1901 | u16 session = msg_session(hdr); | |
1902 | int mtyp = msg_type(hdr); | |
1903 | ||
1904 | if (msg_user(hdr) != LINK_PROTOCOL) | |
1905 | return true; | |
1906 | ||
1907 | switch (mtyp) { | |
1908 | case RESET_MSG: | |
1909 | if (!l->in_session) | |
1910 | return true; | |
1911 | /* Accept only RESET with new session number */ | |
1912 | return more(session, curr_session); | |
1913 | case ACTIVATE_MSG: | |
1914 | if (!l->in_session) | |
1915 | return true; | |
1916 | /* Accept only ACTIVATE with new or current session number */ | |
1917 | return !less(session, curr_session); | |
1918 | case STATE_MSG: | |
1919 | /* Accept only STATE with current session number */ | |
1920 | if (!l->in_session) | |
1921 | return false; | |
1922 | if (session != curr_session) | |
1923 | return false; | |
d949cfed LDC |
1924 | /* Extra sanity check */ |
1925 | if (!link_is_up(l) && msg_ack(hdr)) | |
1926 | return false; | |
7ea817f4 JM |
1927 | if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO)) |
1928 | return true; | |
1929 | /* Accept only STATE with new sequence number */ | |
1930 | return !less(msg_seqno(hdr), l->rcv_nxt_state); | |
1931 | default: | |
1932 | return false; | |
1933 | } | |
1934 | } | |
1935 | ||
d999297c JPM |
1936 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1937 | * Note that network plane id propagates through the network, and may | |
1938 | * change at any time. The node with lowest numerical id determines | |
1939 | * network plane | |
1940 | */ | |
1941 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1942 | struct sk_buff_head *xmitq) | |
1943 | { | |
1944 | struct tipc_msg *hdr = buf_msg(skb); | |
9195948f | 1945 | struct tipc_gap_ack_blks *ga = NULL; |
d999297c | 1946 | u16 rcvgap = 0; |
c1ab3f1d JPM |
1947 | u16 ack = msg_ack(hdr); |
1948 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1949 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1950 | u16 peers_tol = msg_link_tolerance(hdr); | |
1951 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1952 | u16 rcv_nxt = l->rcv_nxt; |
35c55c98 | 1953 | u16 dlen = msg_data_sz(hdr); |
73f646ce | 1954 | int mtyp = msg_type(hdr); |
8d6e79d3 | 1955 | bool reply = msg_probe(hdr); |
9195948f | 1956 | u16 glen = 0; |
35c55c98 | 1957 | void *data; |
d999297c JPM |
1958 | char *if_name; |
1959 | int rc = 0; | |
1960 | ||
26574db0 | 1961 | trace_tipc_proto_rcv(skb, false, l->name); |
52666986 | 1962 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1963 | goto exit; |
1964 | ||
e74a386d | 1965 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
1966 | l->net_plane = msg_net_plane(hdr); |
1967 | ||
35c55c98 JPM |
1968 | skb_linearize(skb); |
1969 | hdr = buf_msg(skb); | |
1970 | data = msg_data(hdr); | |
1971 | ||
26574db0 TL |
1972 | if (!tipc_link_validate_msg(l, hdr)) { |
1973 | trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!"); | |
1974 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!"); | |
7ea817f4 | 1975 | goto exit; |
26574db0 | 1976 | } |
7ea817f4 | 1977 | |
73f646ce | 1978 | switch (mtyp) { |
d999297c | 1979 | case RESET_MSG: |
d999297c | 1980 | case ACTIVATE_MSG: |
d999297c JPM |
1981 | /* Complete own link name with peer's interface name */ |
1982 | if_name = strrchr(l->name, ':') + 1; | |
1983 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1984 | break; | |
1985 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1986 | break; | |
35c55c98 | 1987 | strncpy(if_name, data, TIPC_MAX_IF_NAME); |
d999297c JPM |
1988 | |
1989 | /* Update own tolerance if peer indicates a non-zero value */ | |
047491ea | 1990 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { |
d999297c | 1991 | l->tolerance = peers_tol; |
047491ea JM |
1992 | l->bc_rcvlink->tolerance = peers_tol; |
1993 | } | |
d999297c JPM |
1994 | /* Update own priority if peer's priority is higher */ |
1995 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1996 | l->priority = peers_prio; | |
1997 | ||
7ab412d3 JM |
1998 | /* If peer is going down we want full re-establish cycle */ |
1999 | if (msg_peer_stopping(hdr)) { | |
634696b1 | 2000 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
7ab412d3 JM |
2001 | break; |
2002 | } | |
91986ee1 TL |
2003 | |
2004 | /* If this endpoint was re-created while peer was ESTABLISHING | |
2005 | * it doesn't know current session number. Force re-synch. | |
2006 | */ | |
2007 | if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) && | |
2008 | l->session != msg_dest_session(hdr)) { | |
2009 | if (less(l->session, msg_dest_session(hdr))) | |
2010 | l->session = msg_dest_session(hdr) + 1; | |
2011 | break; | |
2012 | } | |
2013 | ||
7ab412d3 JM |
2014 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
2015 | if (mtyp == RESET_MSG || !link_is_up(l)) | |
73f646ce JPM |
2016 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
2017 | ||
2018 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
7ab412d3 | 2019 | if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING) |
73f646ce JPM |
2020 | rc = TIPC_LINK_UP_EVT; |
2021 | ||
d999297c | 2022 | l->peer_session = msg_session(hdr); |
7ea817f4 | 2023 | l->in_session = true; |
d999297c | 2024 | l->peer_bearer_id = msg_bearer_id(hdr); |
d999297c JPM |
2025 | if (l->mtu > msg_max_pkt(hdr)) |
2026 | l->mtu = msg_max_pkt(hdr); | |
2027 | break; | |
662921cd | 2028 | |
d999297c | 2029 | case STATE_MSG: |
9012de50 JM |
2030 | l->rcv_nxt_state = msg_seqno(hdr) + 1; |
2031 | ||
d999297c | 2032 | /* Update own tolerance if peer indicates a non-zero value */ |
047491ea | 2033 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { |
d999297c | 2034 | l->tolerance = peers_tol; |
047491ea JM |
2035 | l->bc_rcvlink->tolerance = peers_tol; |
2036 | } | |
f7967556 JPM |
2037 | /* Update own prio if peer indicates a different value */ |
2038 | if ((peers_prio != l->priority) && | |
2039 | in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { | |
81729810 RA |
2040 | l->priority = peers_prio; |
2041 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
2042 | } | |
2043 | ||
d999297c JPM |
2044 | l->silent_intv_cnt = 0; |
2045 | l->stats.recv_states++; | |
2046 | if (msg_probe(hdr)) | |
2047 | l->stats.recv_probes++; | |
73f646ce JPM |
2048 | |
2049 | if (!link_is_up(l)) { | |
2050 | if (l->state == LINK_ESTABLISHING) | |
2051 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 2052 | break; |
73f646ce | 2053 | } |
9195948f TL |
2054 | |
2055 | /* Receive Gap ACK blocks from peer if any */ | |
2056 | if (l->peer_caps & TIPC_GAP_ACK_BLOCK) { | |
2057 | ga = (struct tipc_gap_ack_blks *)data; | |
2058 | glen = ntohs(ga->len); | |
2059 | /* sanity check: if failed, ignore Gap ACK blocks */ | |
2060 | if (glen != tipc_gap_ack_blks_sz(ga->gack_cnt)) | |
2061 | ga = NULL; | |
2062 | } | |
2063 | ||
2064 | tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr, | |
35c55c98 | 2065 | &l->mon_state, l->bearer_id); |
d999297c | 2066 | |
662921cd | 2067 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 2068 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c | 2069 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
8d6e79d3 JM |
2070 | if (rcvgap || reply) |
2071 | tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, | |
2072 | rcvgap, 0, 0, xmitq); | |
9195948f | 2073 | |
6a6b5c8b | 2074 | rc |= tipc_link_advance_transmq(l, ack, gap, ga, xmitq); |
d999297c JPM |
2075 | |
2076 | /* If NACK, retransmit will now start at right position */ | |
9195948f | 2077 | if (gap) |
d999297c | 2078 | l->stats.recv_nacks++; |
662921cd | 2079 | |
d999297c JPM |
2080 | tipc_link_advance_backlog(l, xmitq); |
2081 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
2082 | link_prepare_wakeup(l); | |
2083 | } | |
2084 | exit: | |
2085 | kfree_skb(skb); | |
2086 | return rc; | |
2087 | } | |
2088 | ||
52666986 JPM |
2089 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
2090 | */ | |
2091 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
2092 | u16 peers_snd_nxt, | |
2093 | struct sk_buff_head *xmitq) | |
2094 | { | |
2095 | struct sk_buff *skb; | |
2096 | struct tipc_msg *hdr; | |
2097 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
2098 | u16 ack = l->rcv_nxt - 1; | |
2099 | u16 gap_to = peers_snd_nxt - 1; | |
2100 | ||
2101 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 2102 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
2103 | if (!skb) |
2104 | return false; | |
2105 | hdr = buf_msg(skb); | |
2106 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
2107 | msg_set_bcast_ack(hdr, ack); | |
2108 | msg_set_bcgap_after(hdr, ack); | |
2109 | if (dfrd_skb) | |
2110 | gap_to = buf_seqno(dfrd_skb) - 1; | |
2111 | msg_set_bcgap_to(hdr, gap_to); | |
2112 | msg_set_non_seq(hdr, bcast); | |
2113 | __skb_queue_tail(xmitq, skb); | |
2114 | return true; | |
2115 | } | |
2116 | ||
2117 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
2118 | * | |
2119 | * Give a newly added peer node the sequence number where it should | |
2120 | * start receiving and acking broadcast packets. | |
2121 | */ | |
742e0383 WF |
2122 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
2123 | struct sk_buff_head *xmitq) | |
52666986 JPM |
2124 | { |
2125 | struct sk_buff_head list; | |
2126 | ||
2127 | __skb_queue_head_init(&list); | |
2128 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
2129 | return; | |
06bd2b1e | 2130 | msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); |
52666986 JPM |
2131 | tipc_link_xmit(l, &list, xmitq); |
2132 | } | |
2133 | ||
2134 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
2135 | */ | |
2136 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
2137 | { | |
2138 | int mtyp = msg_type(hdr); | |
2139 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
2140 | ||
2141 | if (link_is_up(l)) | |
2142 | return; | |
2143 | ||
2144 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
2145 | l->rcv_nxt = peers_snd_nxt; | |
2146 | l->state = LINK_ESTABLISHED; | |
2147 | return; | |
2148 | } | |
2149 | ||
2150 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
2151 | return; | |
2152 | ||
2153 | if (msg_peer_node_is_up(hdr)) | |
2154 | return; | |
2155 | ||
2156 | /* Compatibility: accept older, less safe initial synch data */ | |
2157 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
2158 | l->rcv_nxt = peers_snd_nxt; | |
2159 | } | |
2160 | ||
2161 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
2162 | */ | |
02d11ca2 JPM |
2163 | int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
2164 | struct sk_buff_head *xmitq) | |
52666986 | 2165 | { |
7c4a54b9 | 2166 | struct tipc_link *snd_l = l->bc_sndlink; |
52666986 | 2167 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
02d11ca2 JPM |
2168 | u16 from = msg_bcast_ack(hdr) + 1; |
2169 | u16 to = from + msg_bc_gap(hdr) - 1; | |
2170 | int rc = 0; | |
52666986 JPM |
2171 | |
2172 | if (!link_is_up(l)) | |
02d11ca2 | 2173 | return rc; |
52666986 JPM |
2174 | |
2175 | if (!msg_peer_node_is_up(hdr)) | |
02d11ca2 | 2176 | return rc; |
52666986 | 2177 | |
2d18ac4b JPM |
2178 | /* Open when peer ackowledges our bcast init msg (pkt #1) */ |
2179 | if (msg_ack(hdr)) | |
2180 | l->bc_peer_is_up = true; | |
2181 | ||
2182 | if (!l->bc_peer_is_up) | |
02d11ca2 | 2183 | return rc; |
52666986 | 2184 | |
7c4a54b9 JPM |
2185 | l->stats.recv_nacks++; |
2186 | ||
52666986 JPM |
2187 | /* Ignore if peers_snd_nxt goes beyond receive window */ |
2188 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
02d11ca2 JPM |
2189 | return rc; |
2190 | ||
6a6b5c8b | 2191 | rc = tipc_link_bc_retrans(snd_l, l, from, to, xmitq); |
02d11ca2 JPM |
2192 | |
2193 | l->snd_nxt = peers_snd_nxt; | |
2194 | if (link_bc_rcv_gap(l)) | |
2195 | rc |= TIPC_LINK_SND_STATE; | |
2196 | ||
2197 | /* Return now if sender supports nack via STATE messages */ | |
2198 | if (l->peer_caps & TIPC_BCAST_STATE_NACK) | |
2199 | return rc; | |
2200 | ||
2201 | /* Otherwise, be backwards compatible */ | |
52666986 JPM |
2202 | |
2203 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
2204 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
02d11ca2 | 2205 | return 0; |
52666986 JPM |
2206 | } |
2207 | ||
2208 | /* Don't NACK if one was recently sent or peeked */ | |
2209 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
2210 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
02d11ca2 | 2211 | return 0; |
52666986 JPM |
2212 | } |
2213 | ||
2214 | /* Conditionally delay NACK sending until next synch rcv */ | |
2215 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
2216 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
2217 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
02d11ca2 | 2218 | return 0; |
52666986 JPM |
2219 | } |
2220 | ||
2221 | /* Send NACK now but suppress next one */ | |
2222 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
2223 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
02d11ca2 | 2224 | return 0; |
52666986 JPM |
2225 | } |
2226 | ||
2227 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
2228 | struct sk_buff_head *xmitq) | |
2229 | { | |
2230 | struct sk_buff *skb, *tmp; | |
2231 | struct tipc_link *snd_l = l->bc_sndlink; | |
2232 | ||
2233 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
2234 | return; | |
2235 | ||
2236 | if (!more(acked, l->acked)) | |
2237 | return; | |
2238 | ||
26574db0 | 2239 | trace_tipc_link_bc_ack(l, l->acked, acked, &snd_l->transmq); |
52666986 JPM |
2240 | /* Skip over packets peer has already acked */ |
2241 | skb_queue_walk(&snd_l->transmq, skb) { | |
2242 | if (more(buf_seqno(skb), l->acked)) | |
2243 | break; | |
2244 | } | |
2245 | ||
2246 | /* Update/release the packets peer is acking now */ | |
2247 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
2248 | if (more(buf_seqno(skb), acked)) | |
2249 | break; | |
2250 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
2251 | __skb_unlink(skb, &snd_l->transmq); | |
2252 | kfree_skb(skb); | |
2253 | } | |
2254 | } | |
2255 | l->acked = acked; | |
2256 | tipc_link_advance_backlog(snd_l, xmitq); | |
2257 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
2258 | link_prepare_wakeup(snd_l); | |
2259 | } | |
2260 | ||
2261 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
02d11ca2 JPM |
2262 | * This function is here for backwards compatibility, since |
2263 | * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. | |
52666986 JPM |
2264 | */ |
2265 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
2266 | struct sk_buff_head *xmitq) | |
2267 | { | |
2268 | struct tipc_msg *hdr = buf_msg(skb); | |
2269 | u32 dnode = msg_destnode(hdr); | |
2270 | int mtyp = msg_type(hdr); | |
2271 | u16 acked = msg_bcast_ack(hdr); | |
2272 | u16 from = acked + 1; | |
2273 | u16 to = msg_bcgap_to(hdr); | |
2274 | u16 peers_snd_nxt = to + 1; | |
2275 | int rc = 0; | |
2276 | ||
2277 | kfree_skb(skb); | |
2278 | ||
2279 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
2280 | return 0; | |
2281 | ||
2282 | if (mtyp != STATE_MSG) | |
2283 | return 0; | |
2284 | ||
e74a386d | 2285 | if (dnode == tipc_own_addr(l->net)) { |
52666986 | 2286 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
6a6b5c8b | 2287 | rc = tipc_link_bc_retrans(l->bc_sndlink, l, from, to, xmitq); |
52666986 JPM |
2288 | l->stats.recv_nacks++; |
2289 | return rc; | |
2290 | } | |
2291 | ||
2292 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
2293 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
2294 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
2295 | ||
2296 | return 0; | |
2297 | } | |
2298 | ||
e3eea1eb | 2299 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 2300 | { |
218527fe | 2301 | int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
2302 | |
2303 | l->window = win; | |
5a0950c2 JPM |
2304 | l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win); |
2305 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2); | |
2306 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3); | |
2307 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4); | |
1f66d161 | 2308 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
b97bf3fd PL |
2309 | } |
2310 | ||
b97bf3fd | 2311 | /** |
38206d59 | 2312 | * link_reset_stats - reset link statistics |
1a90632d | 2313 | * @l: pointer to link |
b97bf3fd | 2314 | */ |
38206d59 | 2315 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 2316 | { |
38206d59 | 2317 | memset(&l->stats, 0, sizeof(l->stats)); |
b97bf3fd PL |
2318 | } |
2319 | ||
1a20cc25 | 2320 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 2321 | { |
1a20cc25 | 2322 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 2323 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 2324 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 2325 | |
662921cd | 2326 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
2327 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
2328 | skb_queue_len(&l->transmq), head, tail, | |
2329 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 2330 | } |
0655f6a8 RA |
2331 | |
2332 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
2333 | */ | |
2334 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
2335 | { | |
2336 | int err; | |
2337 | ||
8cb08174 JB |
2338 | err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop, |
2339 | tipc_nl_prop_policy, NULL); | |
0655f6a8 RA |
2340 | if (err) |
2341 | return err; | |
2342 | ||
2343 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2344 | u32 prio; | |
2345 | ||
2346 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2347 | if (prio > TIPC_MAX_LINK_PRI) | |
2348 | return -EINVAL; | |
2349 | } | |
2350 | ||
2351 | if (props[TIPC_NLA_PROP_TOL]) { | |
2352 | u32 tol; | |
2353 | ||
2354 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2355 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
2356 | return -EINVAL; | |
2357 | } | |
2358 | ||
2359 | if (props[TIPC_NLA_PROP_WIN]) { | |
2360 | u32 win; | |
2361 | ||
2362 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
2363 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
2364 | return -EINVAL; | |
2365 | } | |
2366 | ||
2367 | return 0; | |
2368 | } | |
7be57fc6 | 2369 | |
d8182804 | 2370 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
2371 | { |
2372 | int i; | |
2373 | struct nlattr *stats; | |
2374 | ||
2375 | struct nla_map { | |
2376 | u32 key; | |
2377 | u32 val; | |
2378 | }; | |
2379 | ||
2380 | struct nla_map map[] = { | |
95901122 | 2381 | {TIPC_NLA_STATS_RX_INFO, 0}, |
7be57fc6 RA |
2382 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
2383 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2384 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2385 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
95901122 | 2386 | {TIPC_NLA_STATS_TX_INFO, 0}, |
7be57fc6 RA |
2387 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
2388 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2389 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2390 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2391 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2392 | s->msg_length_counts : 1}, | |
2393 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2394 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2395 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2396 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2397 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2398 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2399 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2400 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2401 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2402 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2403 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2404 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2405 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2406 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2407 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2408 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2409 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2410 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2411 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2412 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2413 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2414 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2415 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2416 | }; | |
2417 | ||
ae0be8de | 2418 | stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
7be57fc6 RA |
2419 | if (!stats) |
2420 | return -EMSGSIZE; | |
2421 | ||
2422 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2423 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2424 | goto msg_full; | |
2425 | ||
2426 | nla_nest_end(skb, stats); | |
2427 | ||
2428 | return 0; | |
2429 | msg_full: | |
2430 | nla_nest_cancel(skb, stats); | |
2431 | ||
2432 | return -EMSGSIZE; | |
2433 | } | |
2434 | ||
2435 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
2436 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2437 | struct tipc_link *link, int nlflags) | |
7be57fc6 | 2438 | { |
23fd3eac | 2439 | u32 self = tipc_own_addr(net); |
7be57fc6 RA |
2440 | struct nlattr *attrs; |
2441 | struct nlattr *prop; | |
23fd3eac JM |
2442 | void *hdr; |
2443 | int err; | |
7be57fc6 | 2444 | |
bfb3e5dd | 2445 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 2446 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
2447 | if (!hdr) |
2448 | return -EMSGSIZE; | |
2449 | ||
ae0be8de | 2450 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
7be57fc6 RA |
2451 | if (!attrs) |
2452 | goto msg_full; | |
2453 | ||
2454 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2455 | goto attr_msg_full; | |
23fd3eac | 2456 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self))) |
7be57fc6 | 2457 | goto attr_msg_full; |
ed193ece | 2458 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 2459 | goto attr_msg_full; |
95901122 | 2460 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) |
7be57fc6 | 2461 | goto attr_msg_full; |
95901122 | 2462 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) |
7be57fc6 RA |
2463 | goto attr_msg_full; |
2464 | ||
2465 | if (tipc_link_is_up(link)) | |
2466 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2467 | goto attr_msg_full; | |
c72fa872 | 2468 | if (link->active) |
7be57fc6 RA |
2469 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
2470 | goto attr_msg_full; | |
2471 | ||
ae0be8de | 2472 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
7be57fc6 RA |
2473 | if (!prop) |
2474 | goto attr_msg_full; | |
2475 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2476 | goto prop_msg_full; | |
2477 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2478 | goto prop_msg_full; | |
2479 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2480 | link->window)) |
7be57fc6 RA |
2481 | goto prop_msg_full; |
2482 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2483 | goto prop_msg_full; | |
2484 | nla_nest_end(msg->skb, prop); | |
2485 | ||
2486 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2487 | if (err) | |
2488 | goto attr_msg_full; | |
2489 | ||
2490 | nla_nest_end(msg->skb, attrs); | |
2491 | genlmsg_end(msg->skb, hdr); | |
2492 | ||
2493 | return 0; | |
2494 | ||
2495 | prop_msg_full: | |
2496 | nla_nest_cancel(msg->skb, prop); | |
2497 | attr_msg_full: | |
2498 | nla_nest_cancel(msg->skb, attrs); | |
2499 | msg_full: | |
2500 | genlmsg_cancel(msg->skb, hdr); | |
2501 | ||
2502 | return -EMSGSIZE; | |
2503 | } | |
38206d59 JPM |
2504 | |
2505 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
2506 | struct tipc_stats *stats) | |
2507 | { | |
2508 | int i; | |
2509 | struct nlattr *nest; | |
2510 | ||
2511 | struct nla_map { | |
2512 | __u32 key; | |
2513 | __u32 val; | |
2514 | }; | |
2515 | ||
2516 | struct nla_map map[] = { | |
95901122 | 2517 | {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, |
38206d59 JPM |
2518 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
2519 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
2520 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
2521 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
95901122 | 2522 | {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, |
38206d59 JPM |
2523 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
2524 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
2525 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
2526 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
2527 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
2528 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
2529 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
2530 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
2531 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
2532 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
2533 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
2534 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
2535 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
2536 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
2537 | }; | |
2538 | ||
ae0be8de | 2539 | nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
38206d59 JPM |
2540 | if (!nest) |
2541 | return -EMSGSIZE; | |
2542 | ||
2543 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2544 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2545 | goto msg_full; | |
2546 | ||
2547 | nla_nest_end(skb, nest); | |
2548 | ||
2549 | return 0; | |
2550 | msg_full: | |
2551 | nla_nest_cancel(skb, nest); | |
2552 | ||
2553 | return -EMSGSIZE; | |
2554 | } | |
2555 | ||
2556 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
2557 | { | |
2558 | int err; | |
2559 | void *hdr; | |
2560 | struct nlattr *attrs; | |
2561 | struct nlattr *prop; | |
2562 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
02ec6caf HL |
2563 | u32 bc_mode = tipc_bcast_get_broadcast_mode(net); |
2564 | u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net); | |
38206d59 JPM |
2565 | struct tipc_link *bcl = tn->bcl; |
2566 | ||
2567 | if (!bcl) | |
2568 | return 0; | |
2569 | ||
2570 | tipc_bcast_lock(net); | |
2571 | ||
2572 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2573 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
2574 | if (!hdr) { |
2575 | tipc_bcast_unlock(net); | |
38206d59 | 2576 | return -EMSGSIZE; |
b53ce3e7 | 2577 | } |
38206d59 | 2578 | |
ae0be8de | 2579 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
38206d59 JPM |
2580 | if (!attrs) |
2581 | goto msg_full; | |
2582 | ||
2583 | /* The broadcast link is always up */ | |
2584 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2585 | goto attr_msg_full; | |
2586 | ||
2587 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
2588 | goto attr_msg_full; | |
2589 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
2590 | goto attr_msg_full; | |
95901122 | 2591 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) |
38206d59 | 2592 | goto attr_msg_full; |
95901122 | 2593 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) |
38206d59 JPM |
2594 | goto attr_msg_full; |
2595 | ||
ae0be8de | 2596 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
38206d59 JPM |
2597 | if (!prop) |
2598 | goto attr_msg_full; | |
2599 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
2600 | goto prop_msg_full; | |
02ec6caf HL |
2601 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode)) |
2602 | goto prop_msg_full; | |
2603 | if (bc_mode & BCLINK_MODE_SEL) | |
2604 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO, | |
2605 | bc_ratio)) | |
2606 | goto prop_msg_full; | |
38206d59 JPM |
2607 | nla_nest_end(msg->skb, prop); |
2608 | ||
2609 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2610 | if (err) | |
2611 | goto attr_msg_full; | |
2612 | ||
2613 | tipc_bcast_unlock(net); | |
2614 | nla_nest_end(msg->skb, attrs); | |
2615 | genlmsg_end(msg->skb, hdr); | |
2616 | ||
2617 | return 0; | |
2618 | ||
2619 | prop_msg_full: | |
2620 | nla_nest_cancel(msg->skb, prop); | |
2621 | attr_msg_full: | |
2622 | nla_nest_cancel(msg->skb, attrs); | |
2623 | msg_full: | |
2624 | tipc_bcast_unlock(net); | |
2625 | genlmsg_cancel(msg->skb, hdr); | |
2626 | ||
2627 | return -EMSGSIZE; | |
2628 | } | |
2629 | ||
d01332f1 RA |
2630 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
2631 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2632 | { |
2633 | l->tolerance = tol; | |
047491ea JM |
2634 | if (l->bc_rcvlink) |
2635 | l->bc_rcvlink->tolerance = tol; | |
37c64cf6 JM |
2636 | if (link_is_up(l)) |
2637 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); | |
38206d59 JPM |
2638 | } |
2639 | ||
d01332f1 RA |
2640 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2641 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2642 | { |
2643 | l->priority = prio; | |
8d6e79d3 | 2644 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2645 | } |
2646 | ||
2647 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2648 | { | |
2649 | l->abort_limit = limit; | |
2650 | } | |
b4b9771b TL |
2651 | |
2652 | char *tipc_link_name_ext(struct tipc_link *l, char *buf) | |
2653 | { | |
2654 | if (!l) | |
2655 | scnprintf(buf, TIPC_MAX_LINK_NAME, "null"); | |
2656 | else if (link_is_bc_sndlink(l)) | |
2657 | scnprintf(buf, TIPC_MAX_LINK_NAME, "broadcast-sender"); | |
2658 | else if (link_is_bc_rcvlink(l)) | |
2659 | scnprintf(buf, TIPC_MAX_LINK_NAME, | |
2660 | "broadcast-receiver, peer %x", l->addr); | |
2661 | else | |
2662 | memcpy(buf, l->name, TIPC_MAX_LINK_NAME); | |
2663 | ||
2664 | return buf; | |
2665 | } | |
2666 | ||
2667 | /** | |
2668 | * tipc_link_dump - dump TIPC link data | |
2669 | * @l: tipc link to be dumped | |
2670 | * @dqueues: bitmask to decide if any link queue to be dumped? | |
2671 | * - TIPC_DUMP_NONE: don't dump link queues | |
2672 | * - TIPC_DUMP_TRANSMQ: dump link transmq queue | |
2673 | * - TIPC_DUMP_BACKLOGQ: dump link backlog queue | |
2674 | * - TIPC_DUMP_DEFERDQ: dump link deferd queue | |
2675 | * - TIPC_DUMP_INPUTQ: dump link input queue | |
2676 | * - TIPC_DUMP_WAKEUP: dump link wakeup queue | |
2677 | * - TIPC_DUMP_ALL: dump all the link queues above | |
2678 | * @buf: returned buffer of dump data in format | |
2679 | */ | |
2680 | int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf) | |
2681 | { | |
2682 | int i = 0; | |
2683 | size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN; | |
2684 | struct sk_buff_head *list; | |
2685 | struct sk_buff *hskb, *tskb; | |
2686 | u32 len; | |
2687 | ||
2688 | if (!l) { | |
2689 | i += scnprintf(buf, sz, "link data: (null)\n"); | |
2690 | return i; | |
2691 | } | |
2692 | ||
2693 | i += scnprintf(buf, sz, "link data: %x", l->addr); | |
2694 | i += scnprintf(buf + i, sz - i, " %x", l->state); | |
2695 | i += scnprintf(buf + i, sz - i, " %u", l->in_session); | |
2696 | i += scnprintf(buf + i, sz - i, " %u", l->session); | |
2697 | i += scnprintf(buf + i, sz - i, " %u", l->peer_session); | |
2698 | i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt); | |
2699 | i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt); | |
2700 | i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state); | |
2701 | i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state); | |
2702 | i += scnprintf(buf + i, sz - i, " %x", l->peer_caps); | |
2703 | i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt); | |
2704 | i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt); | |
71204231 | 2705 | i += scnprintf(buf + i, sz - i, " %u", 0); |
77cf8edb | 2706 | i += scnprintf(buf + i, sz - i, " %u", 0); |
b4b9771b TL |
2707 | i += scnprintf(buf + i, sz - i, " %u", l->acked); |
2708 | ||
2709 | list = &l->transmq; | |
2710 | len = skb_queue_len(list); | |
2711 | hskb = skb_peek(list); | |
2712 | tskb = skb_peek_tail(list); | |
2713 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2714 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2715 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2716 | ||
2717 | list = &l->deferdq; | |
2718 | len = skb_queue_len(list); | |
2719 | hskb = skb_peek(list); | |
2720 | tskb = skb_peek_tail(list); | |
2721 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2722 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2723 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2724 | ||
2725 | list = &l->backlogq; | |
2726 | len = skb_queue_len(list); | |
2727 | hskb = skb_peek(list); | |
2728 | tskb = skb_peek_tail(list); | |
2729 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2730 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2731 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2732 | ||
2733 | list = l->inputq; | |
2734 | len = skb_queue_len(list); | |
2735 | hskb = skb_peek(list); | |
2736 | tskb = skb_peek_tail(list); | |
2737 | i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len, | |
2738 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2739 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2740 | ||
2741 | if (dqueues & TIPC_DUMP_TRANSMQ) { | |
2742 | i += scnprintf(buf + i, sz - i, "transmq: "); | |
2743 | i += tipc_list_dump(&l->transmq, false, buf + i); | |
2744 | } | |
2745 | if (dqueues & TIPC_DUMP_BACKLOGQ) { | |
2746 | i += scnprintf(buf + i, sz - i, | |
2747 | "backlogq: <%u %u %u %u %u>, ", | |
2748 | l->backlog[TIPC_LOW_IMPORTANCE].len, | |
2749 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len, | |
2750 | l->backlog[TIPC_HIGH_IMPORTANCE].len, | |
2751 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len, | |
2752 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len); | |
2753 | i += tipc_list_dump(&l->backlogq, false, buf + i); | |
2754 | } | |
2755 | if (dqueues & TIPC_DUMP_DEFERDQ) { | |
2756 | i += scnprintf(buf + i, sz - i, "deferdq: "); | |
2757 | i += tipc_list_dump(&l->deferdq, false, buf + i); | |
2758 | } | |
2759 | if (dqueues & TIPC_DUMP_INPUTQ) { | |
2760 | i += scnprintf(buf + i, sz - i, "inputq: "); | |
2761 | i += tipc_list_dump(l->inputq, false, buf + i); | |
2762 | } | |
2763 | if (dqueues & TIPC_DUMP_WAKEUP) { | |
2764 | i += scnprintf(buf + i, sz - i, "wakeup: "); | |
2765 | i += tipc_list_dump(&l->wakeupq, false, buf + i); | |
2766 | } | |
2767 | ||
2768 | return i; | |
2769 | } |