Commit | Line | Data |
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17926a79 DH |
1 | /* Management of Tx window, Tx resend, ACKs and out-of-sequence reception |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 DH |
14 | #include <linux/module.h> |
15 | #include <linux/circ_buf.h> | |
16 | #include <linux/net.h> | |
17 | #include <linux/skbuff.h> | |
5a0e3ad6 | 18 | #include <linux/slab.h> |
17926a79 DH |
19 | #include <linux/udp.h> |
20 | #include <net/sock.h> | |
21 | #include <net/af_rxrpc.h> | |
22 | #include "ar-internal.h" | |
23 | ||
17926a79 DH |
24 | /* |
25 | * propose an ACK be sent | |
26 | */ | |
4e36a95e | 27 | void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
563ea7d5 | 28 | u16 skew, u32 serial, bool immediate) |
17926a79 DH |
29 | { |
30 | unsigned long expiry; | |
31 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
32 | ||
33 | ASSERTCMP(prior, >, 0); | |
34 | ||
35 | _enter("{%d},%s,%%%x,%u", | |
0d12f8a4 | 36 | call->debug_id, rxrpc_acks(ack_reason), serial, immediate); |
17926a79 DH |
37 | |
38 | if (prior < rxrpc_ack_priority[call->ackr_reason]) { | |
39 | if (immediate) | |
40 | goto cancel_timer; | |
41 | return; | |
42 | } | |
43 | ||
44 | /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial | |
45 | * numbers */ | |
46 | if (prior == rxrpc_ack_priority[call->ackr_reason]) { | |
563ea7d5 DH |
47 | if (prior <= 4) { |
48 | call->ackr_skew = skew; | |
17926a79 | 49 | call->ackr_serial = serial; |
563ea7d5 | 50 | } |
17926a79 DH |
51 | if (immediate) |
52 | goto cancel_timer; | |
53 | return; | |
54 | } | |
55 | ||
56 | call->ackr_reason = ack_reason; | |
57 | call->ackr_serial = serial; | |
58 | ||
59 | switch (ack_reason) { | |
60 | case RXRPC_ACK_DELAY: | |
61 | _debug("run delay timer"); | |
5873c083 DH |
62 | expiry = rxrpc_soft_ack_delay; |
63 | goto run_timer; | |
17926a79 DH |
64 | |
65 | case RXRPC_ACK_IDLE: | |
66 | if (!immediate) { | |
67 | _debug("run defer timer"); | |
5873c083 | 68 | expiry = rxrpc_idle_ack_delay; |
17926a79 DH |
69 | goto run_timer; |
70 | } | |
71 | goto cancel_timer; | |
72 | ||
73 | case RXRPC_ACK_REQUESTED: | |
5873c083 DH |
74 | expiry = rxrpc_requested_ack_delay; |
75 | if (!expiry) | |
17926a79 | 76 | goto cancel_timer; |
0d12f8a4 | 77 | if (!immediate || serial == 1) { |
17926a79 | 78 | _debug("run defer timer"); |
17926a79 DH |
79 | goto run_timer; |
80 | } | |
81 | ||
82 | default: | |
83 | _debug("immediate ACK"); | |
84 | goto cancel_timer; | |
85 | } | |
86 | ||
87 | run_timer: | |
88 | expiry += jiffies; | |
89 | if (!timer_pending(&call->ack_timer) || | |
90 | time_after(call->ack_timer.expires, expiry)) | |
91 | mod_timer(&call->ack_timer, expiry); | |
92 | return; | |
93 | ||
94 | cancel_timer: | |
0d12f8a4 | 95 | _debug("cancel timer %%%u", serial); |
17926a79 DH |
96 | try_to_del_timer_sync(&call->ack_timer); |
97 | read_lock_bh(&call->state_lock); | |
f5c17aae | 98 | if (call->state < RXRPC_CALL_COMPLETE && |
4c198ad1 | 99 | !test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events)) |
651350d1 | 100 | rxrpc_queue_call(call); |
17926a79 DH |
101 | read_unlock_bh(&call->state_lock); |
102 | } | |
103 | ||
104 | /* | |
105 | * propose an ACK be sent, locking the call structure | |
106 | */ | |
4e36a95e | 107 | void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
563ea7d5 | 108 | u16 skew, u32 serial, bool immediate) |
17926a79 DH |
109 | { |
110 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
111 | ||
112 | if (prior > rxrpc_ack_priority[call->ackr_reason]) { | |
113 | spin_lock_bh(&call->lock); | |
563ea7d5 | 114 | __rxrpc_propose_ACK(call, ack_reason, skew, serial, immediate); |
17926a79 DH |
115 | spin_unlock_bh(&call->lock); |
116 | } | |
117 | } | |
118 | ||
119 | /* | |
120 | * set the resend timer | |
121 | */ | |
122 | static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend, | |
123 | unsigned long resend_at) | |
124 | { | |
125 | read_lock_bh(&call->state_lock); | |
f5c17aae | 126 | if (call->state == RXRPC_CALL_COMPLETE) |
17926a79 DH |
127 | resend = 0; |
128 | ||
129 | if (resend & 1) { | |
130 | _debug("SET RESEND"); | |
4c198ad1 | 131 | set_bit(RXRPC_CALL_EV_RESEND, &call->events); |
17926a79 DH |
132 | } |
133 | ||
134 | if (resend & 2) { | |
135 | _debug("MODIFY RESEND TIMER"); | |
136 | set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
137 | mod_timer(&call->resend_timer, resend_at); | |
138 | } else { | |
139 | _debug("KILL RESEND TIMER"); | |
140 | del_timer_sync(&call->resend_timer); | |
4c198ad1 | 141 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
17926a79 DH |
142 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
143 | } | |
144 | read_unlock_bh(&call->state_lock); | |
145 | } | |
146 | ||
147 | /* | |
148 | * resend packets | |
149 | */ | |
150 | static void rxrpc_resend(struct rxrpc_call *call) | |
151 | { | |
0d12f8a4 | 152 | struct rxrpc_wire_header *whdr; |
17926a79 | 153 | struct rxrpc_skb_priv *sp; |
17926a79 DH |
154 | struct sk_buff *txb; |
155 | unsigned long *p_txb, resend_at; | |
c03ae533 FW |
156 | bool stop; |
157 | int loop; | |
17926a79 DH |
158 | u8 resend; |
159 | ||
160 | _enter("{%d,%d,%d,%d},", | |
161 | call->acks_hard, call->acks_unacked, | |
162 | atomic_read(&call->sequence), | |
163 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
164 | ||
c03ae533 | 165 | stop = false; |
17926a79 DH |
166 | resend = 0; |
167 | resend_at = 0; | |
168 | ||
169 | for (loop = call->acks_tail; | |
170 | loop != call->acks_head || stop; | |
171 | loop = (loop + 1) & (call->acks_winsz - 1) | |
172 | ) { | |
173 | p_txb = call->acks_window + loop; | |
174 | smp_read_barrier_depends(); | |
175 | if (*p_txb & 1) | |
176 | continue; | |
177 | ||
178 | txb = (struct sk_buff *) *p_txb; | |
179 | sp = rxrpc_skb(txb); | |
180 | ||
181 | if (sp->need_resend) { | |
3db1cd5c | 182 | sp->need_resend = false; |
17926a79 DH |
183 | |
184 | /* each Tx packet has a new serial number */ | |
0d12f8a4 | 185 | sp->hdr.serial = atomic_inc_return(&call->conn->serial); |
17926a79 | 186 | |
0d12f8a4 DH |
187 | whdr = (struct rxrpc_wire_header *)txb->head; |
188 | whdr->serial = htonl(sp->hdr.serial); | |
17926a79 DH |
189 | |
190 | _proto("Tx DATA %%%u { #%d }", | |
0d12f8a4 | 191 | sp->hdr.serial, sp->hdr.seq); |
985a5c82 | 192 | if (rxrpc_send_data_packet(call->conn, txb) < 0) { |
c03ae533 | 193 | stop = true; |
17926a79 DH |
194 | sp->resend_at = jiffies + 3; |
195 | } else { | |
45025bce DH |
196 | if (rxrpc_is_client_call(call)) |
197 | rxrpc_expose_client_call(call); | |
17926a79 | 198 | sp->resend_at = |
765dd3bb | 199 | jiffies + rxrpc_resend_timeout; |
17926a79 DH |
200 | } |
201 | } | |
202 | ||
203 | if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 204 | sp->need_resend = true; |
17926a79 DH |
205 | resend |= 1; |
206 | } else if (resend & 2) { | |
207 | if (time_before(sp->resend_at, resend_at)) | |
208 | resend_at = sp->resend_at; | |
209 | } else { | |
210 | resend_at = sp->resend_at; | |
211 | resend |= 2; | |
212 | } | |
213 | } | |
214 | ||
215 | rxrpc_set_resend(call, resend, resend_at); | |
216 | _leave(""); | |
217 | } | |
218 | ||
219 | /* | |
220 | * handle resend timer expiry | |
221 | */ | |
222 | static void rxrpc_resend_timer(struct rxrpc_call *call) | |
223 | { | |
224 | struct rxrpc_skb_priv *sp; | |
225 | struct sk_buff *txb; | |
226 | unsigned long *p_txb, resend_at; | |
227 | int loop; | |
228 | u8 resend; | |
229 | ||
230 | _enter("%d,%d,%d", | |
231 | call->acks_tail, call->acks_unacked, call->acks_head); | |
232 | ||
f5c17aae | 233 | if (call->state == RXRPC_CALL_COMPLETE) |
3b5bac2b DH |
234 | return; |
235 | ||
17926a79 DH |
236 | resend = 0; |
237 | resend_at = 0; | |
238 | ||
239 | for (loop = call->acks_unacked; | |
240 | loop != call->acks_head; | |
241 | loop = (loop + 1) & (call->acks_winsz - 1) | |
242 | ) { | |
243 | p_txb = call->acks_window + loop; | |
244 | smp_read_barrier_depends(); | |
245 | txb = (struct sk_buff *) (*p_txb & ~1); | |
246 | sp = rxrpc_skb(txb); | |
247 | ||
248 | ASSERT(!(*p_txb & 1)); | |
249 | ||
250 | if (sp->need_resend) { | |
251 | ; | |
252 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 253 | sp->need_resend = true; |
17926a79 DH |
254 | resend |= 1; |
255 | } else if (resend & 2) { | |
256 | if (time_before(sp->resend_at, resend_at)) | |
257 | resend_at = sp->resend_at; | |
258 | } else { | |
259 | resend_at = sp->resend_at; | |
260 | resend |= 2; | |
261 | } | |
262 | } | |
263 | ||
264 | rxrpc_set_resend(call, resend, resend_at); | |
265 | _leave(""); | |
266 | } | |
267 | ||
268 | /* | |
269 | * process soft ACKs of our transmitted packets | |
270 | * - these indicate packets the peer has or has not received, but hasn't yet | |
271 | * given to the consumer, and so can still be discarded and re-requested | |
272 | */ | |
273 | static int rxrpc_process_soft_ACKs(struct rxrpc_call *call, | |
274 | struct rxrpc_ackpacket *ack, | |
275 | struct sk_buff *skb) | |
276 | { | |
277 | struct rxrpc_skb_priv *sp; | |
278 | struct sk_buff *txb; | |
279 | unsigned long *p_txb, resend_at; | |
280 | int loop; | |
281 | u8 sacks[RXRPC_MAXACKS], resend; | |
282 | ||
283 | _enter("{%d,%d},{%d},", | |
284 | call->acks_hard, | |
285 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz), | |
286 | ack->nAcks); | |
287 | ||
288 | if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0) | |
289 | goto protocol_error; | |
290 | ||
291 | resend = 0; | |
292 | resend_at = 0; | |
293 | for (loop = 0; loop < ack->nAcks; loop++) { | |
294 | p_txb = call->acks_window; | |
295 | p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1); | |
296 | smp_read_barrier_depends(); | |
297 | txb = (struct sk_buff *) (*p_txb & ~1); | |
298 | sp = rxrpc_skb(txb); | |
299 | ||
300 | switch (sacks[loop]) { | |
301 | case RXRPC_ACK_TYPE_ACK: | |
3db1cd5c | 302 | sp->need_resend = false; |
17926a79 DH |
303 | *p_txb |= 1; |
304 | break; | |
305 | case RXRPC_ACK_TYPE_NACK: | |
3db1cd5c | 306 | sp->need_resend = true; |
17926a79 DH |
307 | *p_txb &= ~1; |
308 | resend = 1; | |
309 | break; | |
310 | default: | |
311 | _debug("Unsupported ACK type %d", sacks[loop]); | |
312 | goto protocol_error; | |
313 | } | |
314 | } | |
315 | ||
316 | smp_mb(); | |
317 | call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1); | |
318 | ||
319 | /* anything not explicitly ACK'd is implicitly NACK'd, but may just not | |
320 | * have been received or processed yet by the far end */ | |
321 | for (loop = call->acks_unacked; | |
322 | loop != call->acks_head; | |
323 | loop = (loop + 1) & (call->acks_winsz - 1) | |
324 | ) { | |
325 | p_txb = call->acks_window + loop; | |
326 | smp_read_barrier_depends(); | |
327 | txb = (struct sk_buff *) (*p_txb & ~1); | |
328 | sp = rxrpc_skb(txb); | |
329 | ||
330 | if (*p_txb & 1) { | |
331 | /* packet must have been discarded */ | |
3db1cd5c | 332 | sp->need_resend = true; |
17926a79 DH |
333 | *p_txb &= ~1; |
334 | resend |= 1; | |
335 | } else if (sp->need_resend) { | |
336 | ; | |
337 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 338 | sp->need_resend = true; |
17926a79 DH |
339 | resend |= 1; |
340 | } else if (resend & 2) { | |
341 | if (time_before(sp->resend_at, resend_at)) | |
342 | resend_at = sp->resend_at; | |
343 | } else { | |
344 | resend_at = sp->resend_at; | |
345 | resend |= 2; | |
346 | } | |
347 | } | |
348 | ||
349 | rxrpc_set_resend(call, resend, resend_at); | |
350 | _leave(" = 0"); | |
351 | return 0; | |
352 | ||
353 | protocol_error: | |
354 | _leave(" = -EPROTO"); | |
355 | return -EPROTO; | |
356 | } | |
357 | ||
358 | /* | |
359 | * discard hard-ACK'd packets from the Tx window | |
360 | */ | |
361 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard) | |
362 | { | |
17926a79 DH |
363 | unsigned long _skb; |
364 | int tail = call->acks_tail, old_tail; | |
365 | int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz); | |
366 | ||
8f7e6e75 | 367 | _enter("{%u,%u},%u", call->acks_hard, win, hard); |
17926a79 DH |
368 | |
369 | ASSERTCMP(hard - call->acks_hard, <=, win); | |
370 | ||
371 | while (call->acks_hard < hard) { | |
372 | smp_read_barrier_depends(); | |
373 | _skb = call->acks_window[tail] & ~1; | |
17926a79 DH |
374 | rxrpc_free_skb((struct sk_buff *) _skb); |
375 | old_tail = tail; | |
376 | tail = (tail + 1) & (call->acks_winsz - 1); | |
377 | call->acks_tail = tail; | |
378 | if (call->acks_unacked == old_tail) | |
379 | call->acks_unacked = tail; | |
380 | call->acks_hard++; | |
381 | } | |
382 | ||
45025bce | 383 | wake_up(&call->waitq); |
17926a79 DH |
384 | } |
385 | ||
386 | /* | |
387 | * clear the Tx window in the event of a failure | |
388 | */ | |
389 | static void rxrpc_clear_tx_window(struct rxrpc_call *call) | |
390 | { | |
391 | rxrpc_rotate_tx_window(call, atomic_read(&call->sequence)); | |
392 | } | |
393 | ||
394 | /* | |
395 | * drain the out of sequence received packet queue into the packet Rx queue | |
396 | */ | |
397 | static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call) | |
398 | { | |
399 | struct rxrpc_skb_priv *sp; | |
400 | struct sk_buff *skb; | |
401 | bool terminal; | |
402 | int ret; | |
403 | ||
404 | _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos); | |
405 | ||
406 | spin_lock_bh(&call->lock); | |
407 | ||
408 | ret = -ECONNRESET; | |
409 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
410 | goto socket_unavailable; | |
411 | ||
412 | skb = skb_dequeue(&call->rx_oos_queue); | |
413 | if (skb) { | |
df844fd4 | 414 | rxrpc_see_skb(skb); |
17926a79 DH |
415 | sp = rxrpc_skb(skb); |
416 | ||
417 | _debug("drain OOS packet %d [%d]", | |
0d12f8a4 | 418 | sp->hdr.seq, call->rx_first_oos); |
17926a79 | 419 | |
0d12f8a4 | 420 | if (sp->hdr.seq != call->rx_first_oos) { |
17926a79 | 421 | skb_queue_head(&call->rx_oos_queue, skb); |
0d12f8a4 | 422 | call->rx_first_oos = rxrpc_skb(skb)->hdr.seq; |
17926a79 DH |
423 | _debug("requeue %p {%u}", skb, call->rx_first_oos); |
424 | } else { | |
425 | skb->mark = RXRPC_SKB_MARK_DATA; | |
426 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
427 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
428 | ret = rxrpc_queue_rcv_skb(call, skb, true, terminal); | |
429 | BUG_ON(ret < 0); | |
430 | _debug("drain #%u", call->rx_data_post); | |
431 | call->rx_data_post++; | |
432 | ||
433 | /* find out what the next packet is */ | |
434 | skb = skb_peek(&call->rx_oos_queue); | |
df844fd4 | 435 | rxrpc_see_skb(skb); |
17926a79 | 436 | if (skb) |
0d12f8a4 | 437 | call->rx_first_oos = rxrpc_skb(skb)->hdr.seq; |
17926a79 DH |
438 | else |
439 | call->rx_first_oos = 0; | |
440 | _debug("peek %p {%u}", skb, call->rx_first_oos); | |
441 | } | |
442 | } | |
443 | ||
444 | ret = 0; | |
445 | socket_unavailable: | |
446 | spin_unlock_bh(&call->lock); | |
447 | _leave(" = %d", ret); | |
448 | return ret; | |
449 | } | |
450 | ||
451 | /* | |
452 | * insert an out of sequence packet into the buffer | |
453 | */ | |
454 | static void rxrpc_insert_oos_packet(struct rxrpc_call *call, | |
455 | struct sk_buff *skb) | |
456 | { | |
457 | struct rxrpc_skb_priv *sp, *psp; | |
458 | struct sk_buff *p; | |
459 | u32 seq; | |
460 | ||
461 | sp = rxrpc_skb(skb); | |
0d12f8a4 | 462 | seq = sp->hdr.seq; |
17926a79 DH |
463 | _enter(",,{%u}", seq); |
464 | ||
465 | skb->destructor = rxrpc_packet_destructor; | |
466 | ASSERTCMP(sp->call, ==, NULL); | |
467 | sp->call = call; | |
e34d4234 | 468 | rxrpc_get_call_for_skb(call, skb); |
17926a79 DH |
469 | |
470 | /* insert into the buffer in sequence order */ | |
471 | spin_lock_bh(&call->lock); | |
472 | ||
473 | skb_queue_walk(&call->rx_oos_queue, p) { | |
474 | psp = rxrpc_skb(p); | |
0d12f8a4 DH |
475 | if (psp->hdr.seq > seq) { |
476 | _debug("insert oos #%u before #%u", seq, psp->hdr.seq); | |
17926a79 DH |
477 | skb_insert(p, skb, &call->rx_oos_queue); |
478 | goto inserted; | |
479 | } | |
480 | } | |
481 | ||
482 | _debug("append oos #%u", seq); | |
483 | skb_queue_tail(&call->rx_oos_queue, skb); | |
484 | inserted: | |
485 | ||
486 | /* we might now have a new front to the queue */ | |
487 | if (call->rx_first_oos == 0 || seq < call->rx_first_oos) | |
488 | call->rx_first_oos = seq; | |
489 | ||
490 | read_lock(&call->state_lock); | |
491 | if (call->state < RXRPC_CALL_COMPLETE && | |
492 | call->rx_data_post == call->rx_first_oos) { | |
493 | _debug("drain rx oos now"); | |
4c198ad1 | 494 | set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events); |
17926a79 DH |
495 | } |
496 | read_unlock(&call->state_lock); | |
497 | ||
498 | spin_unlock_bh(&call->lock); | |
499 | _leave(" [stored #%u]", call->rx_first_oos); | |
500 | } | |
501 | ||
502 | /* | |
503 | * clear the Tx window on final ACK reception | |
504 | */ | |
505 | static void rxrpc_zap_tx_window(struct rxrpc_call *call) | |
506 | { | |
507 | struct rxrpc_skb_priv *sp; | |
508 | struct sk_buff *skb; | |
509 | unsigned long _skb, *acks_window; | |
4e36a95e | 510 | u8 winsz = call->acks_winsz; |
17926a79 DH |
511 | int tail; |
512 | ||
513 | acks_window = call->acks_window; | |
514 | call->acks_window = NULL; | |
515 | ||
516 | while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) { | |
517 | tail = call->acks_tail; | |
518 | smp_read_barrier_depends(); | |
519 | _skb = acks_window[tail] & ~1; | |
520 | smp_mb(); | |
521 | call->acks_tail = (call->acks_tail + 1) & (winsz - 1); | |
522 | ||
523 | skb = (struct sk_buff *) _skb; | |
524 | sp = rxrpc_skb(skb); | |
0d12f8a4 | 525 | _debug("+++ clear Tx %u", sp->hdr.seq); |
17926a79 DH |
526 | rxrpc_free_skb(skb); |
527 | } | |
528 | ||
529 | kfree(acks_window); | |
530 | } | |
531 | ||
224711df DH |
532 | /* |
533 | * process the extra information that may be appended to an ACK packet | |
534 | */ | |
535 | static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, | |
95c96174 | 536 | unsigned int latest, int nAcks) |
224711df DH |
537 | { |
538 | struct rxrpc_ackinfo ackinfo; | |
539 | struct rxrpc_peer *peer; | |
95c96174 | 540 | unsigned int mtu; |
224711df DH |
541 | |
542 | if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) { | |
543 | _leave(" [no ackinfo]"); | |
544 | return; | |
545 | } | |
546 | ||
547 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
548 | latest, | |
549 | ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU), | |
550 | ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max)); | |
551 | ||
552 | mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU)); | |
553 | ||
ea82aaec | 554 | peer = call->peer; |
224711df DH |
555 | if (mtu < peer->maxdata) { |
556 | spin_lock_bh(&peer->lock); | |
557 | peer->maxdata = mtu; | |
558 | peer->mtu = mtu + peer->hdrsize; | |
559 | spin_unlock_bh(&peer->lock); | |
560 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
561 | } | |
562 | } | |
563 | ||
17926a79 DH |
564 | /* |
565 | * process packets in the reception queue | |
566 | */ | |
567 | static int rxrpc_process_rx_queue(struct rxrpc_call *call, | |
568 | u32 *_abort_code) | |
569 | { | |
570 | struct rxrpc_ackpacket ack; | |
571 | struct rxrpc_skb_priv *sp; | |
572 | struct sk_buff *skb; | |
573 | bool post_ACK; | |
574 | int latest; | |
575 | u32 hard, tx; | |
576 | ||
577 | _enter(""); | |
578 | ||
579 | process_further: | |
580 | skb = skb_dequeue(&call->rx_queue); | |
581 | if (!skb) | |
582 | return -EAGAIN; | |
583 | ||
df844fd4 | 584 | rxrpc_see_skb(skb); |
17926a79 DH |
585 | _net("deferred skb %p", skb); |
586 | ||
587 | sp = rxrpc_skb(skb); | |
588 | ||
589 | _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state); | |
590 | ||
591 | post_ACK = false; | |
592 | ||
593 | switch (sp->hdr.type) { | |
594 | /* data packets that wind up here have been received out of | |
595 | * order, need security processing or are jumbo packets */ | |
596 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 597 | _proto("OOSQ DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 DH |
598 | |
599 | /* secured packets must be verified and possibly decrypted */ | |
e0e4d82f DH |
600 | if (call->conn->security->verify_packet(call, skb, |
601 | _abort_code) < 0) | |
17926a79 DH |
602 | goto protocol_error; |
603 | ||
604 | rxrpc_insert_oos_packet(call, skb); | |
605 | goto process_further; | |
606 | ||
607 | /* partial ACK to process */ | |
608 | case RXRPC_PACKET_TYPE_ACK: | |
609 | if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) { | |
610 | _debug("extraction failure"); | |
611 | goto protocol_error; | |
612 | } | |
613 | if (!skb_pull(skb, sizeof(ack))) | |
614 | BUG(); | |
615 | ||
0d12f8a4 | 616 | latest = sp->hdr.serial; |
17926a79 DH |
617 | hard = ntohl(ack.firstPacket); |
618 | tx = atomic_read(&call->sequence); | |
619 | ||
620 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
621 | latest, | |
622 | ntohs(ack.maxSkew), | |
623 | hard, | |
624 | ntohl(ack.previousPacket), | |
625 | ntohl(ack.serial), | |
08d4d217 | 626 | rxrpc_acks(ack.reason), |
17926a79 DH |
627 | ack.nAcks); |
628 | ||
224711df DH |
629 | rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks); |
630 | ||
17926a79 DH |
631 | if (ack.reason == RXRPC_ACK_PING) { |
632 | _proto("Rx ACK %%%u PING Request", latest); | |
633 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
563ea7d5 | 634 | skb->priority, sp->hdr.serial, true); |
17926a79 DH |
635 | } |
636 | ||
637 | /* discard any out-of-order or duplicate ACKs */ | |
638 | if (latest - call->acks_latest <= 0) { | |
639 | _debug("discard ACK %d <= %d", | |
640 | latest, call->acks_latest); | |
641 | goto discard; | |
642 | } | |
643 | call->acks_latest = latest; | |
644 | ||
645 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
646 | call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
647 | call->state != RXRPC_CALL_SERVER_SEND_REPLY && | |
648 | call->state != RXRPC_CALL_SERVER_AWAIT_ACK) | |
649 | goto discard; | |
650 | ||
651 | _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state); | |
652 | ||
653 | if (hard > 0) { | |
654 | if (hard - 1 > tx) { | |
655 | _debug("hard-ACK'd packet %d not transmitted" | |
656 | " (%d top)", | |
657 | hard - 1, tx); | |
658 | goto protocol_error; | |
659 | } | |
660 | ||
661 | if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY || | |
662 | call->state == RXRPC_CALL_SERVER_AWAIT_ACK) && | |
33c40e24 DH |
663 | hard > tx) { |
664 | call->acks_hard = tx; | |
17926a79 | 665 | goto all_acked; |
33c40e24 | 666 | } |
17926a79 DH |
667 | |
668 | smp_rmb(); | |
669 | rxrpc_rotate_tx_window(call, hard - 1); | |
670 | } | |
671 | ||
672 | if (ack.nAcks > 0) { | |
673 | if (hard - 1 + ack.nAcks > tx) { | |
674 | _debug("soft-ACK'd packet %d+%d not" | |
675 | " transmitted (%d top)", | |
676 | hard - 1, ack.nAcks, tx); | |
677 | goto protocol_error; | |
678 | } | |
679 | ||
680 | if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0) | |
681 | goto protocol_error; | |
682 | } | |
683 | goto discard; | |
684 | ||
685 | /* complete ACK to process */ | |
686 | case RXRPC_PACKET_TYPE_ACKALL: | |
687 | goto all_acked; | |
688 | ||
689 | /* abort and busy are handled elsewhere */ | |
690 | case RXRPC_PACKET_TYPE_BUSY: | |
691 | case RXRPC_PACKET_TYPE_ABORT: | |
692 | BUG(); | |
693 | ||
694 | /* connection level events - also handled elsewhere */ | |
695 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
696 | case RXRPC_PACKET_TYPE_RESPONSE: | |
697 | case RXRPC_PACKET_TYPE_DEBUG: | |
698 | BUG(); | |
699 | } | |
700 | ||
701 | /* if we've had a hard ACK that covers all the packets we've sent, then | |
702 | * that ends that phase of the operation */ | |
703 | all_acked: | |
704 | write_lock_bh(&call->state_lock); | |
705 | _debug("ack all %d", call->state); | |
706 | ||
707 | switch (call->state) { | |
708 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
709 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
710 | break; | |
711 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
712 | _debug("srv complete"); | |
f5c17aae | 713 | __rxrpc_call_completed(call); |
17926a79 DH |
714 | post_ACK = true; |
715 | break; | |
716 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
717 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
718 | goto protocol_error_unlock; /* can't occur yet */ | |
719 | default: | |
720 | write_unlock_bh(&call->state_lock); | |
721 | goto discard; /* assume packet left over from earlier phase */ | |
722 | } | |
723 | ||
724 | write_unlock_bh(&call->state_lock); | |
725 | ||
726 | /* if all the packets we sent are hard-ACK'd, then we can discard | |
727 | * whatever we've got left */ | |
728 | _debug("clear Tx %d", | |
729 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
730 | ||
731 | del_timer_sync(&call->resend_timer); | |
732 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
4c198ad1 | 733 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
17926a79 DH |
734 | |
735 | if (call->acks_window) | |
736 | rxrpc_zap_tx_window(call); | |
737 | ||
738 | if (post_ACK) { | |
739 | /* post the final ACK message for userspace to pick up */ | |
740 | _debug("post ACK"); | |
741 | skb->mark = RXRPC_SKB_MARK_FINAL_ACK; | |
742 | sp->call = call; | |
e34d4234 | 743 | rxrpc_get_call_for_skb(call, skb); |
17926a79 DH |
744 | spin_lock_bh(&call->lock); |
745 | if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0) | |
746 | BUG(); | |
747 | spin_unlock_bh(&call->lock); | |
748 | goto process_further; | |
749 | } | |
750 | ||
751 | discard: | |
752 | rxrpc_free_skb(skb); | |
753 | goto process_further; | |
754 | ||
755 | protocol_error_unlock: | |
756 | write_unlock_bh(&call->state_lock); | |
757 | protocol_error: | |
758 | rxrpc_free_skb(skb); | |
759 | _leave(" = -EPROTO"); | |
760 | return -EPROTO; | |
761 | } | |
762 | ||
763 | /* | |
764 | * post a message to the socket Rx queue for recvmsg() to pick up | |
765 | */ | |
766 | static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, | |
767 | bool fatal) | |
768 | { | |
769 | struct rxrpc_skb_priv *sp; | |
770 | struct sk_buff *skb; | |
771 | int ret; | |
772 | ||
773 | _enter("{%d,%lx},%u,%u,%d", | |
774 | call->debug_id, call->flags, mark, error, fatal); | |
775 | ||
776 | /* remove timers and things for fatal messages */ | |
777 | if (fatal) { | |
778 | del_timer_sync(&call->resend_timer); | |
779 | del_timer_sync(&call->ack_timer); | |
780 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
781 | } | |
782 | ||
783 | if (mark != RXRPC_SKB_MARK_NEW_CALL && | |
784 | !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
785 | _leave("[no userid]"); | |
786 | return 0; | |
787 | } | |
788 | ||
789 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
790 | skb = alloc_skb(0, GFP_NOFS); | |
791 | if (!skb) | |
792 | return -ENOMEM; | |
793 | ||
794 | rxrpc_new_skb(skb); | |
795 | ||
796 | skb->mark = mark; | |
797 | ||
798 | sp = rxrpc_skb(skb); | |
799 | memset(sp, 0, sizeof(*sp)); | |
800 | sp->error = error; | |
801 | sp->call = call; | |
e34d4234 | 802 | rxrpc_get_call_for_skb(call, skb); |
17926a79 DH |
803 | |
804 | spin_lock_bh(&call->lock); | |
805 | ret = rxrpc_queue_rcv_skb(call, skb, true, fatal); | |
806 | spin_unlock_bh(&call->lock); | |
163e3cb7 | 807 | BUG_ON(ret < 0); |
17926a79 DH |
808 | } |
809 | ||
810 | return 0; | |
811 | } | |
812 | ||
813 | /* | |
8d94aa38 DH |
814 | * Handle background processing of incoming call packets and ACK / abort |
815 | * generation. A ref on the call is donated to us by whoever queued the work | |
816 | * item. | |
17926a79 DH |
817 | */ |
818 | void rxrpc_process_call(struct work_struct *work) | |
819 | { | |
820 | struct rxrpc_call *call = | |
821 | container_of(work, struct rxrpc_call, processor); | |
0d12f8a4 | 822 | struct rxrpc_wire_header whdr; |
17926a79 DH |
823 | struct rxrpc_ackpacket ack; |
824 | struct rxrpc_ackinfo ackinfo; | |
17926a79 DH |
825 | struct msghdr msg; |
826 | struct kvec iov[5]; | |
5b8848d1 | 827 | enum rxrpc_call_event genbit; |
17926a79 | 828 | unsigned long bits; |
224711df | 829 | __be32 data, pad; |
17926a79 | 830 | size_t len; |
8d94aa38 | 831 | bool requeue = false; |
5b8848d1 | 832 | int loop, nbit, ioc, ret, mtu; |
0d12f8a4 | 833 | u32 serial, abort_code = RX_PROTOCOL_ERROR; |
17926a79 DH |
834 | u8 *acks = NULL; |
835 | ||
e34d4234 DH |
836 | rxrpc_see_call(call); |
837 | ||
17926a79 DH |
838 | //printk("\n--------------------\n"); |
839 | _enter("{%d,%s,%lx} [%lu]", | |
840 | call->debug_id, rxrpc_call_states[call->state], call->events, | |
841 | (jiffies - call->creation_jif) / (HZ / 10)); | |
842 | ||
8d94aa38 DH |
843 | if (call->state >= RXRPC_CALL_COMPLETE) { |
844 | rxrpc_put_call(call, rxrpc_call_put); | |
845 | return; | |
846 | } | |
847 | ||
f9dc5757 DH |
848 | if (!call->conn) |
849 | goto skip_msg_init; | |
850 | ||
17926a79 DH |
851 | /* there's a good chance we're going to have to send a message, so set |
852 | * one up in advance */ | |
ea82aaec DH |
853 | msg.msg_name = &call->peer->srx.transport; |
854 | msg.msg_namelen = call->peer->srx.transport_len; | |
17926a79 DH |
855 | msg.msg_control = NULL; |
856 | msg.msg_controllen = 0; | |
857 | msg.msg_flags = 0; | |
858 | ||
19ffa01c | 859 | whdr.epoch = htonl(call->conn->proto.epoch); |
0d12f8a4 DH |
860 | whdr.cid = htonl(call->cid); |
861 | whdr.callNumber = htonl(call->call_id); | |
862 | whdr.seq = 0; | |
863 | whdr.type = RXRPC_PACKET_TYPE_ACK; | |
864 | whdr.flags = call->conn->out_clientflag; | |
865 | whdr.userStatus = 0; | |
866 | whdr.securityIndex = call->conn->security_ix; | |
867 | whdr._rsvd = 0; | |
868 | whdr.serviceId = htons(call->service_id); | |
17926a79 DH |
869 | |
870 | memset(iov, 0, sizeof(iov)); | |
0d12f8a4 DH |
871 | iov[0].iov_base = &whdr; |
872 | iov[0].iov_len = sizeof(whdr); | |
f9dc5757 | 873 | skip_msg_init: |
17926a79 DH |
874 | |
875 | /* deal with events of a final nature */ | |
4c198ad1 | 876 | if (test_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events)) { |
f66d7490 | 877 | enum rxrpc_skb_mark mark; |
17926a79 | 878 | |
4c198ad1 DH |
879 | clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
880 | clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events); | |
881 | clear_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
17926a79 | 882 | |
f5c17aae | 883 | if (call->completion == RXRPC_CALL_NETWORK_ERROR) { |
f66d7490 | 884 | mark = RXRPC_SKB_MARK_NET_ERROR; |
00b5407e | 885 | _debug("post net error %d", call->error); |
f66d7490 DH |
886 | } else { |
887 | mark = RXRPC_SKB_MARK_LOCAL_ERROR; | |
00b5407e | 888 | _debug("post net local error %d", call->error); |
f66d7490 | 889 | } |
17926a79 | 890 | |
f5c17aae | 891 | if (rxrpc_post_message(call, mark, call->error, true) < 0) |
17926a79 | 892 | goto no_mem; |
4c198ad1 | 893 | clear_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events); |
17926a79 DH |
894 | goto kill_ACKs; |
895 | } | |
896 | ||
4c198ad1 | 897 | if (test_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events)) { |
f5c17aae | 898 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 899 | |
4c198ad1 DH |
900 | clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events); |
901 | clear_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
17926a79 DH |
902 | |
903 | _debug("post conn abort"); | |
904 | ||
905 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
f5c17aae | 906 | call->error, true) < 0) |
17926a79 | 907 | goto no_mem; |
4c198ad1 | 908 | clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
17926a79 DH |
909 | goto kill_ACKs; |
910 | } | |
911 | ||
4c198ad1 | 912 | if (test_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events)) { |
0d12f8a4 | 913 | whdr.type = RXRPC_PACKET_TYPE_BUSY; |
4c198ad1 | 914 | genbit = RXRPC_CALL_EV_REJECT_BUSY; |
17926a79 DH |
915 | goto send_message; |
916 | } | |
917 | ||
4c198ad1 | 918 | if (test_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
f5c17aae | 919 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 DH |
920 | |
921 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
f5c17aae | 922 | call->error, true) < 0) |
17926a79 | 923 | goto no_mem; |
0d12f8a4 | 924 | whdr.type = RXRPC_PACKET_TYPE_ABORT; |
f5c17aae | 925 | data = htonl(call->abort_code); |
17926a79 DH |
926 | iov[1].iov_base = &data; |
927 | iov[1].iov_len = sizeof(data); | |
4c198ad1 | 928 | genbit = RXRPC_CALL_EV_ABORT; |
17926a79 DH |
929 | goto send_message; |
930 | } | |
931 | ||
4c198ad1 DH |
932 | if (test_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events)) { |
933 | genbit = RXRPC_CALL_EV_ACK_FINAL; | |
224711df DH |
934 | |
935 | ack.bufferSpace = htons(8); | |
936 | ack.maxSkew = 0; | |
937 | ack.serial = 0; | |
938 | ack.reason = RXRPC_ACK_IDLE; | |
939 | ack.nAcks = 0; | |
940 | call->ackr_reason = 0; | |
941 | ||
942 | spin_lock_bh(&call->lock); | |
0d12f8a4 DH |
943 | ack.serial = htonl(call->ackr_serial); |
944 | ack.previousPacket = htonl(call->ackr_prev_seq); | |
945 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
224711df DH |
946 | spin_unlock_bh(&call->lock); |
947 | ||
948 | pad = 0; | |
949 | ||
950 | iov[1].iov_base = &ack; | |
951 | iov[1].iov_len = sizeof(ack); | |
952 | iov[2].iov_base = &pad; | |
953 | iov[2].iov_len = 3; | |
954 | iov[3].iov_base = &ackinfo; | |
955 | iov[3].iov_len = sizeof(ackinfo); | |
956 | goto send_ACK; | |
17926a79 DH |
957 | } |
958 | ||
4c198ad1 DH |
959 | if (call->events & ((1 << RXRPC_CALL_EV_RCVD_BUSY) | |
960 | (1 << RXRPC_CALL_EV_RCVD_ABORT)) | |
17926a79 DH |
961 | ) { |
962 | u32 mark; | |
963 | ||
4c198ad1 | 964 | if (test_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events)) |
17926a79 DH |
965 | mark = RXRPC_SKB_MARK_REMOTE_ABORT; |
966 | else | |
967 | mark = RXRPC_SKB_MARK_BUSY; | |
968 | ||
969 | _debug("post abort/busy"); | |
970 | rxrpc_clear_tx_window(call); | |
971 | if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0) | |
972 | goto no_mem; | |
973 | ||
4c198ad1 DH |
974 | clear_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
975 | clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); | |
17926a79 DH |
976 | goto kill_ACKs; |
977 | } | |
978 | ||
4c198ad1 | 979 | if (test_and_clear_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events)) { |
17926a79 DH |
980 | _debug("do implicit ackall"); |
981 | rxrpc_clear_tx_window(call); | |
982 | } | |
983 | ||
4c198ad1 | 984 | if (test_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events)) { |
f5c17aae | 985 | rxrpc_abort_call(call, RX_CALL_TIMEOUT, ETIME); |
17926a79 DH |
986 | |
987 | _debug("post timeout"); | |
988 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
989 | ETIME, true) < 0) | |
990 | goto no_mem; | |
991 | ||
4c198ad1 | 992 | clear_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events); |
17926a79 DH |
993 | goto kill_ACKs; |
994 | } | |
995 | ||
996 | /* deal with assorted inbound messages */ | |
997 | if (!skb_queue_empty(&call->rx_queue)) { | |
f5c17aae DH |
998 | ret = rxrpc_process_rx_queue(call, &abort_code); |
999 | switch (ret) { | |
17926a79 DH |
1000 | case 0: |
1001 | case -EAGAIN: | |
1002 | break; | |
1003 | case -ENOMEM: | |
1004 | goto no_mem; | |
1005 | case -EKEYEXPIRED: | |
1006 | case -EKEYREJECTED: | |
1007 | case -EPROTO: | |
f5c17aae | 1008 | rxrpc_abort_call(call, abort_code, -ret); |
17926a79 DH |
1009 | goto kill_ACKs; |
1010 | } | |
1011 | } | |
1012 | ||
1013 | /* handle resending */ | |
4c198ad1 | 1014 | if (test_and_clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events)) |
17926a79 | 1015 | rxrpc_resend_timer(call); |
4c198ad1 | 1016 | if (test_and_clear_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
17926a79 DH |
1017 | rxrpc_resend(call); |
1018 | ||
1019 | /* consider sending an ordinary ACK */ | |
4c198ad1 | 1020 | if (test_bit(RXRPC_CALL_EV_ACK, &call->events)) { |
17926a79 DH |
1021 | _debug("send ACK: window: %d - %d { %lx }", |
1022 | call->rx_data_eaten, call->ackr_win_top, | |
1023 | call->ackr_window[0]); | |
1024 | ||
1025 | if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST && | |
1026 | call->ackr_reason != RXRPC_ACK_PING_RESPONSE) { | |
1027 | /* ACK by sending reply DATA packet in this state */ | |
4c198ad1 | 1028 | clear_bit(RXRPC_CALL_EV_ACK, &call->events); |
17926a79 DH |
1029 | goto maybe_reschedule; |
1030 | } | |
1031 | ||
4c198ad1 | 1032 | genbit = RXRPC_CALL_EV_ACK; |
17926a79 DH |
1033 | |
1034 | acks = kzalloc(call->ackr_win_top - call->rx_data_eaten, | |
1035 | GFP_NOFS); | |
1036 | if (!acks) | |
1037 | goto no_mem; | |
1038 | ||
1039 | //hdr.flags = RXRPC_SLOW_START_OK; | |
1040 | ack.bufferSpace = htons(8); | |
1041 | ack.maxSkew = 0; | |
17926a79 | 1042 | |
17926a79 | 1043 | spin_lock_bh(&call->lock); |
0d12f8a4 DH |
1044 | ack.reason = call->ackr_reason; |
1045 | ack.serial = htonl(call->ackr_serial); | |
1046 | ack.previousPacket = htonl(call->ackr_prev_seq); | |
17926a79 DH |
1047 | ack.firstPacket = htonl(call->rx_data_eaten + 1); |
1048 | ||
1049 | ack.nAcks = 0; | |
1050 | for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { | |
1051 | nbit = loop * BITS_PER_LONG; | |
1052 | for (bits = call->ackr_window[loop]; bits; bits >>= 1 | |
1053 | ) { | |
1054 | _debug("- l=%d n=%d b=%lx", loop, nbit, bits); | |
1055 | if (bits & 1) { | |
1056 | acks[nbit] = RXRPC_ACK_TYPE_ACK; | |
1057 | ack.nAcks = nbit + 1; | |
1058 | } | |
1059 | nbit++; | |
1060 | } | |
1061 | } | |
1062 | call->ackr_reason = 0; | |
1063 | spin_unlock_bh(&call->lock); | |
1064 | ||
1065 | pad = 0; | |
1066 | ||
1067 | iov[1].iov_base = &ack; | |
1068 | iov[1].iov_len = sizeof(ack); | |
1069 | iov[2].iov_base = acks; | |
1070 | iov[2].iov_len = ack.nAcks; | |
1071 | iov[3].iov_base = &pad; | |
1072 | iov[3].iov_len = 3; | |
1073 | iov[4].iov_base = &ackinfo; | |
1074 | iov[4].iov_len = sizeof(ackinfo); | |
1075 | ||
1076 | switch (ack.reason) { | |
1077 | case RXRPC_ACK_REQUESTED: | |
1078 | case RXRPC_ACK_DUPLICATE: | |
1079 | case RXRPC_ACK_OUT_OF_SEQUENCE: | |
1080 | case RXRPC_ACK_EXCEEDS_WINDOW: | |
1081 | case RXRPC_ACK_NOSPACE: | |
1082 | case RXRPC_ACK_PING: | |
1083 | case RXRPC_ACK_PING_RESPONSE: | |
1084 | goto send_ACK_with_skew; | |
1085 | case RXRPC_ACK_DELAY: | |
1086 | case RXRPC_ACK_IDLE: | |
1087 | goto send_ACK; | |
1088 | } | |
1089 | } | |
1090 | ||
1091 | /* handle completion of security negotiations on an incoming | |
1092 | * connection */ | |
4c198ad1 | 1093 | if (test_and_clear_bit(RXRPC_CALL_EV_SECURED, &call->events)) { |
17926a79 DH |
1094 | _debug("secured"); |
1095 | spin_lock_bh(&call->lock); | |
1096 | ||
1097 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
8d94aa38 | 1098 | struct rxrpc_sock *rx; |
17926a79 | 1099 | _debug("securing"); |
8d94aa38 DH |
1100 | rcu_read_lock(); |
1101 | rx = rcu_dereference(call->socket); | |
1102 | if (rx) { | |
1103 | write_lock(&rx->call_lock); | |
1104 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags)) { | |
1105 | _debug("not released"); | |
1106 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
1107 | list_move_tail(&call->accept_link, | |
1108 | &rx->acceptq); | |
1109 | } | |
1110 | write_unlock(&rx->call_lock); | |
17926a79 | 1111 | } |
8d94aa38 | 1112 | rcu_read_unlock(); |
17926a79 DH |
1113 | read_lock(&call->state_lock); |
1114 | if (call->state < RXRPC_CALL_COMPLETE) | |
4c198ad1 | 1115 | set_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events); |
17926a79 DH |
1116 | read_unlock(&call->state_lock); |
1117 | } | |
1118 | ||
1119 | spin_unlock_bh(&call->lock); | |
4c198ad1 | 1120 | if (!test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) |
17926a79 DH |
1121 | goto maybe_reschedule; |
1122 | } | |
1123 | ||
1124 | /* post a notification of an acceptable connection to the app */ | |
4c198ad1 | 1125 | if (test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) { |
17926a79 DH |
1126 | _debug("post accept"); |
1127 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL, | |
1128 | 0, false) < 0) | |
1129 | goto no_mem; | |
4c198ad1 | 1130 | clear_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events); |
17926a79 DH |
1131 | goto maybe_reschedule; |
1132 | } | |
1133 | ||
1134 | /* handle incoming call acceptance */ | |
4c198ad1 | 1135 | if (test_and_clear_bit(RXRPC_CALL_EV_ACCEPTED, &call->events)) { |
17926a79 DH |
1136 | _debug("accepted"); |
1137 | ASSERTCMP(call->rx_data_post, ==, 0); | |
1138 | call->rx_data_post = 1; | |
1139 | read_lock_bh(&call->state_lock); | |
1140 | if (call->state < RXRPC_CALL_COMPLETE) | |
4c198ad1 | 1141 | set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events); |
17926a79 DH |
1142 | read_unlock_bh(&call->state_lock); |
1143 | } | |
1144 | ||
1145 | /* drain the out of sequence received packet queue into the packet Rx | |
1146 | * queue */ | |
4c198ad1 | 1147 | if (test_and_clear_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) { |
17926a79 DH |
1148 | while (call->rx_data_post == call->rx_first_oos) |
1149 | if (rxrpc_drain_rx_oos_queue(call) < 0) | |
1150 | break; | |
1151 | goto maybe_reschedule; | |
1152 | } | |
1153 | ||
1154 | /* other events may have been raised since we started checking */ | |
1155 | goto maybe_reschedule; | |
1156 | ||
1157 | send_ACK_with_skew: | |
563ea7d5 | 1158 | ack.maxSkew = htons(call->ackr_skew); |
17926a79 | 1159 | send_ACK: |
ea82aaec DH |
1160 | mtu = call->peer->if_mtu; |
1161 | mtu -= call->peer->hdrsize; | |
224711df | 1162 | ackinfo.maxMTU = htonl(mtu); |
817913d8 | 1163 | ackinfo.rwind = htonl(rxrpc_rx_window_size); |
224711df DH |
1164 | |
1165 | /* permit the peer to send us jumbo packets if it wants to */ | |
817913d8 DH |
1166 | ackinfo.rxMTU = htonl(rxrpc_rx_mtu); |
1167 | ackinfo.jumbo_max = htonl(rxrpc_rx_jumbo_max); | |
224711df | 1168 | |
0d12f8a4 DH |
1169 | serial = atomic_inc_return(&call->conn->serial); |
1170 | whdr.serial = htonl(serial); | |
17926a79 | 1171 | _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", |
0d12f8a4 | 1172 | serial, |
17926a79 DH |
1173 | ntohs(ack.maxSkew), |
1174 | ntohl(ack.firstPacket), | |
1175 | ntohl(ack.previousPacket), | |
1176 | ntohl(ack.serial), | |
08d4d217 | 1177 | rxrpc_acks(ack.reason), |
17926a79 DH |
1178 | ack.nAcks); |
1179 | ||
1180 | del_timer_sync(&call->ack_timer); | |
1181 | if (ack.nAcks > 0) | |
1182 | set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags); | |
1183 | goto send_message_2; | |
1184 | ||
1185 | send_message: | |
1186 | _debug("send message"); | |
1187 | ||
0d12f8a4 DH |
1188 | serial = atomic_inc_return(&call->conn->serial); |
1189 | whdr.serial = htonl(serial); | |
1190 | _proto("Tx %s %%%u", rxrpc_pkts[whdr.type], serial); | |
17926a79 DH |
1191 | send_message_2: |
1192 | ||
1193 | len = iov[0].iov_len; | |
1194 | ioc = 1; | |
1195 | if (iov[4].iov_len) { | |
1196 | ioc = 5; | |
1197 | len += iov[4].iov_len; | |
1198 | len += iov[3].iov_len; | |
1199 | len += iov[2].iov_len; | |
1200 | len += iov[1].iov_len; | |
1201 | } else if (iov[3].iov_len) { | |
1202 | ioc = 4; | |
1203 | len += iov[3].iov_len; | |
1204 | len += iov[2].iov_len; | |
1205 | len += iov[1].iov_len; | |
1206 | } else if (iov[2].iov_len) { | |
1207 | ioc = 3; | |
1208 | len += iov[2].iov_len; | |
1209 | len += iov[1].iov_len; | |
1210 | } else if (iov[1].iov_len) { | |
1211 | ioc = 2; | |
1212 | len += iov[1].iov_len; | |
1213 | } | |
1214 | ||
85f32278 | 1215 | ret = kernel_sendmsg(call->conn->params.local->socket, |
17926a79 DH |
1216 | &msg, iov, ioc, len); |
1217 | if (ret < 0) { | |
1218 | _debug("sendmsg failed: %d", ret); | |
8d94aa38 DH |
1219 | if (call->state < RXRPC_CALL_COMPLETE) |
1220 | requeue = true; | |
17926a79 DH |
1221 | goto error; |
1222 | } | |
1223 | ||
1224 | switch (genbit) { | |
4c198ad1 | 1225 | case RXRPC_CALL_EV_ABORT: |
17926a79 | 1226 | clear_bit(genbit, &call->events); |
4c198ad1 | 1227 | clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
17926a79 DH |
1228 | goto kill_ACKs; |
1229 | ||
4c198ad1 | 1230 | case RXRPC_CALL_EV_ACK_FINAL: |
f5c17aae | 1231 | rxrpc_call_completed(call); |
17926a79 DH |
1232 | goto kill_ACKs; |
1233 | ||
1234 | default: | |
1235 | clear_bit(genbit, &call->events); | |
1236 | switch (call->state) { | |
1237 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
1238 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
1239 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
1240 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
1241 | _debug("start ACK timer"); | |
1242 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, | |
563ea7d5 DH |
1243 | call->ackr_skew, call->ackr_serial, |
1244 | false); | |
17926a79 DH |
1245 | default: |
1246 | break; | |
1247 | } | |
1248 | goto maybe_reschedule; | |
1249 | } | |
1250 | ||
1251 | kill_ACKs: | |
1252 | del_timer_sync(&call->ack_timer); | |
4c198ad1 | 1253 | clear_bit(RXRPC_CALL_EV_ACK, &call->events); |
17926a79 DH |
1254 | |
1255 | maybe_reschedule: | |
1256 | if (call->events || !skb_queue_empty(&call->rx_queue)) { | |
8d94aa38 DH |
1257 | if (call->state < RXRPC_CALL_COMPLETE) |
1258 | requeue = true; | |
17926a79 DH |
1259 | } |
1260 | ||
1261 | error: | |
17926a79 DH |
1262 | kfree(acks); |
1263 | ||
8d94aa38 | 1264 | if ((requeue || call->events) && !work_pending(&call->processor)) { |
19ffa01c | 1265 | _debug("jumpstart %x", call->conn->proto.cid); |
8d94aa38 DH |
1266 | __rxrpc_queue_call(call); |
1267 | } else { | |
1268 | rxrpc_put_call(call, rxrpc_call_put); | |
17926a79 DH |
1269 | } |
1270 | ||
1271 | _leave(""); | |
1272 | return; | |
1273 | ||
1274 | no_mem: | |
1275 | _debug("out of memory"); | |
1276 | goto maybe_reschedule; | |
1277 | } |