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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 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/circ_buf.h> | |
14 | #include <linux/net.h> | |
15 | #include <linux/skbuff.h> | |
5a0e3ad6 | 16 | #include <linux/slab.h> |
17926a79 DH |
17 | #include <linux/udp.h> |
18 | #include <net/sock.h> | |
19 | #include <net/af_rxrpc.h> | |
20 | #include "ar-internal.h" | |
21 | ||
17926a79 DH |
22 | /* |
23 | * propose an ACK be sent | |
24 | */ | |
4e36a95e | 25 | void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
0d12f8a4 | 26 | u32 serial, bool immediate) |
17926a79 DH |
27 | { |
28 | unsigned long expiry; | |
29 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
30 | ||
31 | ASSERTCMP(prior, >, 0); | |
32 | ||
33 | _enter("{%d},%s,%%%x,%u", | |
0d12f8a4 | 34 | call->debug_id, rxrpc_acks(ack_reason), serial, immediate); |
17926a79 DH |
35 | |
36 | if (prior < rxrpc_ack_priority[call->ackr_reason]) { | |
37 | if (immediate) | |
38 | goto cancel_timer; | |
39 | return; | |
40 | } | |
41 | ||
42 | /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial | |
43 | * numbers */ | |
44 | if (prior == rxrpc_ack_priority[call->ackr_reason]) { | |
45 | if (prior <= 4) | |
46 | call->ackr_serial = serial; | |
47 | if (immediate) | |
48 | goto cancel_timer; | |
49 | return; | |
50 | } | |
51 | ||
52 | call->ackr_reason = ack_reason; | |
53 | call->ackr_serial = serial; | |
54 | ||
55 | switch (ack_reason) { | |
56 | case RXRPC_ACK_DELAY: | |
57 | _debug("run delay timer"); | |
5873c083 DH |
58 | expiry = rxrpc_soft_ack_delay; |
59 | goto run_timer; | |
17926a79 DH |
60 | |
61 | case RXRPC_ACK_IDLE: | |
62 | if (!immediate) { | |
63 | _debug("run defer timer"); | |
5873c083 | 64 | expiry = rxrpc_idle_ack_delay; |
17926a79 DH |
65 | goto run_timer; |
66 | } | |
67 | goto cancel_timer; | |
68 | ||
69 | case RXRPC_ACK_REQUESTED: | |
5873c083 DH |
70 | expiry = rxrpc_requested_ack_delay; |
71 | if (!expiry) | |
17926a79 | 72 | goto cancel_timer; |
0d12f8a4 | 73 | if (!immediate || serial == 1) { |
17926a79 | 74 | _debug("run defer timer"); |
17926a79 DH |
75 | goto run_timer; |
76 | } | |
77 | ||
78 | default: | |
79 | _debug("immediate ACK"); | |
80 | goto cancel_timer; | |
81 | } | |
82 | ||
83 | run_timer: | |
84 | expiry += jiffies; | |
85 | if (!timer_pending(&call->ack_timer) || | |
86 | time_after(call->ack_timer.expires, expiry)) | |
87 | mod_timer(&call->ack_timer, expiry); | |
88 | return; | |
89 | ||
90 | cancel_timer: | |
0d12f8a4 | 91 | _debug("cancel timer %%%u", serial); |
17926a79 DH |
92 | try_to_del_timer_sync(&call->ack_timer); |
93 | read_lock_bh(&call->state_lock); | |
94 | if (call->state <= RXRPC_CALL_COMPLETE && | |
4c198ad1 | 95 | !test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events)) |
651350d1 | 96 | rxrpc_queue_call(call); |
17926a79 DH |
97 | read_unlock_bh(&call->state_lock); |
98 | } | |
99 | ||
100 | /* | |
101 | * propose an ACK be sent, locking the call structure | |
102 | */ | |
4e36a95e | 103 | void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
0d12f8a4 | 104 | u32 serial, bool immediate) |
17926a79 DH |
105 | { |
106 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
107 | ||
108 | if (prior > rxrpc_ack_priority[call->ackr_reason]) { | |
109 | spin_lock_bh(&call->lock); | |
110 | __rxrpc_propose_ACK(call, ack_reason, serial, immediate); | |
111 | spin_unlock_bh(&call->lock); | |
112 | } | |
113 | } | |
114 | ||
115 | /* | |
116 | * set the resend timer | |
117 | */ | |
118 | static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend, | |
119 | unsigned long resend_at) | |
120 | { | |
121 | read_lock_bh(&call->state_lock); | |
122 | if (call->state >= RXRPC_CALL_COMPLETE) | |
123 | resend = 0; | |
124 | ||
125 | if (resend & 1) { | |
126 | _debug("SET RESEND"); | |
4c198ad1 | 127 | set_bit(RXRPC_CALL_EV_RESEND, &call->events); |
17926a79 DH |
128 | } |
129 | ||
130 | if (resend & 2) { | |
131 | _debug("MODIFY RESEND TIMER"); | |
132 | set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
133 | mod_timer(&call->resend_timer, resend_at); | |
134 | } else { | |
135 | _debug("KILL RESEND TIMER"); | |
136 | del_timer_sync(&call->resend_timer); | |
4c198ad1 | 137 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
17926a79 DH |
138 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
139 | } | |
140 | read_unlock_bh(&call->state_lock); | |
141 | } | |
142 | ||
143 | /* | |
144 | * resend packets | |
145 | */ | |
146 | static void rxrpc_resend(struct rxrpc_call *call) | |
147 | { | |
0d12f8a4 | 148 | struct rxrpc_wire_header *whdr; |
17926a79 | 149 | struct rxrpc_skb_priv *sp; |
17926a79 DH |
150 | struct sk_buff *txb; |
151 | unsigned long *p_txb, resend_at; | |
c03ae533 FW |
152 | bool stop; |
153 | int loop; | |
17926a79 DH |
154 | u8 resend; |
155 | ||
156 | _enter("{%d,%d,%d,%d},", | |
157 | call->acks_hard, call->acks_unacked, | |
158 | atomic_read(&call->sequence), | |
159 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
160 | ||
c03ae533 | 161 | stop = false; |
17926a79 DH |
162 | resend = 0; |
163 | resend_at = 0; | |
164 | ||
165 | for (loop = call->acks_tail; | |
166 | loop != call->acks_head || stop; | |
167 | loop = (loop + 1) & (call->acks_winsz - 1) | |
168 | ) { | |
169 | p_txb = call->acks_window + loop; | |
170 | smp_read_barrier_depends(); | |
171 | if (*p_txb & 1) | |
172 | continue; | |
173 | ||
174 | txb = (struct sk_buff *) *p_txb; | |
175 | sp = rxrpc_skb(txb); | |
176 | ||
177 | if (sp->need_resend) { | |
3db1cd5c | 178 | sp->need_resend = false; |
17926a79 DH |
179 | |
180 | /* each Tx packet has a new serial number */ | |
0d12f8a4 | 181 | sp->hdr.serial = atomic_inc_return(&call->conn->serial); |
17926a79 | 182 | |
0d12f8a4 DH |
183 | whdr = (struct rxrpc_wire_header *)txb->head; |
184 | whdr->serial = htonl(sp->hdr.serial); | |
17926a79 DH |
185 | |
186 | _proto("Tx DATA %%%u { #%d }", | |
0d12f8a4 | 187 | sp->hdr.serial, sp->hdr.seq); |
17926a79 | 188 | if (rxrpc_send_packet(call->conn->trans, txb) < 0) { |
c03ae533 | 189 | stop = true; |
17926a79 DH |
190 | sp->resend_at = jiffies + 3; |
191 | } else { | |
192 | sp->resend_at = | |
765dd3bb | 193 | jiffies + rxrpc_resend_timeout; |
17926a79 DH |
194 | } |
195 | } | |
196 | ||
197 | if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 198 | sp->need_resend = true; |
17926a79 DH |
199 | resend |= 1; |
200 | } else if (resend & 2) { | |
201 | if (time_before(sp->resend_at, resend_at)) | |
202 | resend_at = sp->resend_at; | |
203 | } else { | |
204 | resend_at = sp->resend_at; | |
205 | resend |= 2; | |
206 | } | |
207 | } | |
208 | ||
209 | rxrpc_set_resend(call, resend, resend_at); | |
210 | _leave(""); | |
211 | } | |
212 | ||
213 | /* | |
214 | * handle resend timer expiry | |
215 | */ | |
216 | static void rxrpc_resend_timer(struct rxrpc_call *call) | |
217 | { | |
218 | struct rxrpc_skb_priv *sp; | |
219 | struct sk_buff *txb; | |
220 | unsigned long *p_txb, resend_at; | |
221 | int loop; | |
222 | u8 resend; | |
223 | ||
224 | _enter("%d,%d,%d", | |
225 | call->acks_tail, call->acks_unacked, call->acks_head); | |
226 | ||
3b5bac2b DH |
227 | if (call->state >= RXRPC_CALL_COMPLETE) |
228 | return; | |
229 | ||
17926a79 DH |
230 | resend = 0; |
231 | resend_at = 0; | |
232 | ||
233 | for (loop = call->acks_unacked; | |
234 | loop != call->acks_head; | |
235 | loop = (loop + 1) & (call->acks_winsz - 1) | |
236 | ) { | |
237 | p_txb = call->acks_window + loop; | |
238 | smp_read_barrier_depends(); | |
239 | txb = (struct sk_buff *) (*p_txb & ~1); | |
240 | sp = rxrpc_skb(txb); | |
241 | ||
242 | ASSERT(!(*p_txb & 1)); | |
243 | ||
244 | if (sp->need_resend) { | |
245 | ; | |
246 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 247 | sp->need_resend = true; |
17926a79 DH |
248 | resend |= 1; |
249 | } else if (resend & 2) { | |
250 | if (time_before(sp->resend_at, resend_at)) | |
251 | resend_at = sp->resend_at; | |
252 | } else { | |
253 | resend_at = sp->resend_at; | |
254 | resend |= 2; | |
255 | } | |
256 | } | |
257 | ||
258 | rxrpc_set_resend(call, resend, resend_at); | |
259 | _leave(""); | |
260 | } | |
261 | ||
262 | /* | |
263 | * process soft ACKs of our transmitted packets | |
264 | * - these indicate packets the peer has or has not received, but hasn't yet | |
265 | * given to the consumer, and so can still be discarded and re-requested | |
266 | */ | |
267 | static int rxrpc_process_soft_ACKs(struct rxrpc_call *call, | |
268 | struct rxrpc_ackpacket *ack, | |
269 | struct sk_buff *skb) | |
270 | { | |
271 | struct rxrpc_skb_priv *sp; | |
272 | struct sk_buff *txb; | |
273 | unsigned long *p_txb, resend_at; | |
274 | int loop; | |
275 | u8 sacks[RXRPC_MAXACKS], resend; | |
276 | ||
277 | _enter("{%d,%d},{%d},", | |
278 | call->acks_hard, | |
279 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz), | |
280 | ack->nAcks); | |
281 | ||
282 | if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0) | |
283 | goto protocol_error; | |
284 | ||
285 | resend = 0; | |
286 | resend_at = 0; | |
287 | for (loop = 0; loop < ack->nAcks; loop++) { | |
288 | p_txb = call->acks_window; | |
289 | p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1); | |
290 | smp_read_barrier_depends(); | |
291 | txb = (struct sk_buff *) (*p_txb & ~1); | |
292 | sp = rxrpc_skb(txb); | |
293 | ||
294 | switch (sacks[loop]) { | |
295 | case RXRPC_ACK_TYPE_ACK: | |
3db1cd5c | 296 | sp->need_resend = false; |
17926a79 DH |
297 | *p_txb |= 1; |
298 | break; | |
299 | case RXRPC_ACK_TYPE_NACK: | |
3db1cd5c | 300 | sp->need_resend = true; |
17926a79 DH |
301 | *p_txb &= ~1; |
302 | resend = 1; | |
303 | break; | |
304 | default: | |
305 | _debug("Unsupported ACK type %d", sacks[loop]); | |
306 | goto protocol_error; | |
307 | } | |
308 | } | |
309 | ||
310 | smp_mb(); | |
311 | call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1); | |
312 | ||
313 | /* anything not explicitly ACK'd is implicitly NACK'd, but may just not | |
314 | * have been received or processed yet by the far end */ | |
315 | for (loop = call->acks_unacked; | |
316 | loop != call->acks_head; | |
317 | loop = (loop + 1) & (call->acks_winsz - 1) | |
318 | ) { | |
319 | p_txb = call->acks_window + loop; | |
320 | smp_read_barrier_depends(); | |
321 | txb = (struct sk_buff *) (*p_txb & ~1); | |
322 | sp = rxrpc_skb(txb); | |
323 | ||
324 | if (*p_txb & 1) { | |
325 | /* packet must have been discarded */ | |
3db1cd5c | 326 | sp->need_resend = true; |
17926a79 DH |
327 | *p_txb &= ~1; |
328 | resend |= 1; | |
329 | } else if (sp->need_resend) { | |
330 | ; | |
331 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 332 | sp->need_resend = true; |
17926a79 DH |
333 | resend |= 1; |
334 | } else if (resend & 2) { | |
335 | if (time_before(sp->resend_at, resend_at)) | |
336 | resend_at = sp->resend_at; | |
337 | } else { | |
338 | resend_at = sp->resend_at; | |
339 | resend |= 2; | |
340 | } | |
341 | } | |
342 | ||
343 | rxrpc_set_resend(call, resend, resend_at); | |
344 | _leave(" = 0"); | |
345 | return 0; | |
346 | ||
347 | protocol_error: | |
348 | _leave(" = -EPROTO"); | |
349 | return -EPROTO; | |
350 | } | |
351 | ||
352 | /* | |
353 | * discard hard-ACK'd packets from the Tx window | |
354 | */ | |
355 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard) | |
356 | { | |
17926a79 DH |
357 | unsigned long _skb; |
358 | int tail = call->acks_tail, old_tail; | |
359 | int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz); | |
360 | ||
8f7e6e75 | 361 | _enter("{%u,%u},%u", call->acks_hard, win, hard); |
17926a79 DH |
362 | |
363 | ASSERTCMP(hard - call->acks_hard, <=, win); | |
364 | ||
365 | while (call->acks_hard < hard) { | |
366 | smp_read_barrier_depends(); | |
367 | _skb = call->acks_window[tail] & ~1; | |
17926a79 DH |
368 | rxrpc_free_skb((struct sk_buff *) _skb); |
369 | old_tail = tail; | |
370 | tail = (tail + 1) & (call->acks_winsz - 1); | |
371 | call->acks_tail = tail; | |
372 | if (call->acks_unacked == old_tail) | |
373 | call->acks_unacked = tail; | |
374 | call->acks_hard++; | |
375 | } | |
376 | ||
377 | wake_up(&call->tx_waitq); | |
378 | } | |
379 | ||
380 | /* | |
381 | * clear the Tx window in the event of a failure | |
382 | */ | |
383 | static void rxrpc_clear_tx_window(struct rxrpc_call *call) | |
384 | { | |
385 | rxrpc_rotate_tx_window(call, atomic_read(&call->sequence)); | |
386 | } | |
387 | ||
388 | /* | |
389 | * drain the out of sequence received packet queue into the packet Rx queue | |
390 | */ | |
391 | static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call) | |
392 | { | |
393 | struct rxrpc_skb_priv *sp; | |
394 | struct sk_buff *skb; | |
395 | bool terminal; | |
396 | int ret; | |
397 | ||
398 | _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos); | |
399 | ||
400 | spin_lock_bh(&call->lock); | |
401 | ||
402 | ret = -ECONNRESET; | |
403 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
404 | goto socket_unavailable; | |
405 | ||
406 | skb = skb_dequeue(&call->rx_oos_queue); | |
407 | if (skb) { | |
408 | sp = rxrpc_skb(skb); | |
409 | ||
410 | _debug("drain OOS packet %d [%d]", | |
0d12f8a4 | 411 | sp->hdr.seq, call->rx_first_oos); |
17926a79 | 412 | |
0d12f8a4 | 413 | if (sp->hdr.seq != call->rx_first_oos) { |
17926a79 | 414 | skb_queue_head(&call->rx_oos_queue, skb); |
0d12f8a4 | 415 | call->rx_first_oos = rxrpc_skb(skb)->hdr.seq; |
17926a79 DH |
416 | _debug("requeue %p {%u}", skb, call->rx_first_oos); |
417 | } else { | |
418 | skb->mark = RXRPC_SKB_MARK_DATA; | |
419 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
420 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
421 | ret = rxrpc_queue_rcv_skb(call, skb, true, terminal); | |
422 | BUG_ON(ret < 0); | |
423 | _debug("drain #%u", call->rx_data_post); | |
424 | call->rx_data_post++; | |
425 | ||
426 | /* find out what the next packet is */ | |
427 | skb = skb_peek(&call->rx_oos_queue); | |
428 | if (skb) | |
0d12f8a4 | 429 | call->rx_first_oos = rxrpc_skb(skb)->hdr.seq; |
17926a79 DH |
430 | else |
431 | call->rx_first_oos = 0; | |
432 | _debug("peek %p {%u}", skb, call->rx_first_oos); | |
433 | } | |
434 | } | |
435 | ||
436 | ret = 0; | |
437 | socket_unavailable: | |
438 | spin_unlock_bh(&call->lock); | |
439 | _leave(" = %d", ret); | |
440 | return ret; | |
441 | } | |
442 | ||
443 | /* | |
444 | * insert an out of sequence packet into the buffer | |
445 | */ | |
446 | static void rxrpc_insert_oos_packet(struct rxrpc_call *call, | |
447 | struct sk_buff *skb) | |
448 | { | |
449 | struct rxrpc_skb_priv *sp, *psp; | |
450 | struct sk_buff *p; | |
451 | u32 seq; | |
452 | ||
453 | sp = rxrpc_skb(skb); | |
0d12f8a4 | 454 | seq = sp->hdr.seq; |
17926a79 DH |
455 | _enter(",,{%u}", seq); |
456 | ||
457 | skb->destructor = rxrpc_packet_destructor; | |
458 | ASSERTCMP(sp->call, ==, NULL); | |
459 | sp->call = call; | |
460 | rxrpc_get_call(call); | |
461 | ||
462 | /* insert into the buffer in sequence order */ | |
463 | spin_lock_bh(&call->lock); | |
464 | ||
465 | skb_queue_walk(&call->rx_oos_queue, p) { | |
466 | psp = rxrpc_skb(p); | |
0d12f8a4 DH |
467 | if (psp->hdr.seq > seq) { |
468 | _debug("insert oos #%u before #%u", seq, psp->hdr.seq); | |
17926a79 DH |
469 | skb_insert(p, skb, &call->rx_oos_queue); |
470 | goto inserted; | |
471 | } | |
472 | } | |
473 | ||
474 | _debug("append oos #%u", seq); | |
475 | skb_queue_tail(&call->rx_oos_queue, skb); | |
476 | inserted: | |
477 | ||
478 | /* we might now have a new front to the queue */ | |
479 | if (call->rx_first_oos == 0 || seq < call->rx_first_oos) | |
480 | call->rx_first_oos = seq; | |
481 | ||
482 | read_lock(&call->state_lock); | |
483 | if (call->state < RXRPC_CALL_COMPLETE && | |
484 | call->rx_data_post == call->rx_first_oos) { | |
485 | _debug("drain rx oos now"); | |
4c198ad1 | 486 | set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events); |
17926a79 DH |
487 | } |
488 | read_unlock(&call->state_lock); | |
489 | ||
490 | spin_unlock_bh(&call->lock); | |
491 | _leave(" [stored #%u]", call->rx_first_oos); | |
492 | } | |
493 | ||
494 | /* | |
495 | * clear the Tx window on final ACK reception | |
496 | */ | |
497 | static void rxrpc_zap_tx_window(struct rxrpc_call *call) | |
498 | { | |
499 | struct rxrpc_skb_priv *sp; | |
500 | struct sk_buff *skb; | |
501 | unsigned long _skb, *acks_window; | |
4e36a95e | 502 | u8 winsz = call->acks_winsz; |
17926a79 DH |
503 | int tail; |
504 | ||
505 | acks_window = call->acks_window; | |
506 | call->acks_window = NULL; | |
507 | ||
508 | while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) { | |
509 | tail = call->acks_tail; | |
510 | smp_read_barrier_depends(); | |
511 | _skb = acks_window[tail] & ~1; | |
512 | smp_mb(); | |
513 | call->acks_tail = (call->acks_tail + 1) & (winsz - 1); | |
514 | ||
515 | skb = (struct sk_buff *) _skb; | |
516 | sp = rxrpc_skb(skb); | |
0d12f8a4 | 517 | _debug("+++ clear Tx %u", sp->hdr.seq); |
17926a79 DH |
518 | rxrpc_free_skb(skb); |
519 | } | |
520 | ||
521 | kfree(acks_window); | |
522 | } | |
523 | ||
224711df DH |
524 | /* |
525 | * process the extra information that may be appended to an ACK packet | |
526 | */ | |
527 | static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, | |
95c96174 | 528 | unsigned int latest, int nAcks) |
224711df DH |
529 | { |
530 | struct rxrpc_ackinfo ackinfo; | |
531 | struct rxrpc_peer *peer; | |
95c96174 | 532 | unsigned int mtu; |
224711df DH |
533 | |
534 | if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) { | |
535 | _leave(" [no ackinfo]"); | |
536 | return; | |
537 | } | |
538 | ||
539 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
540 | latest, | |
541 | ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU), | |
542 | ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max)); | |
543 | ||
544 | mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU)); | |
545 | ||
546 | peer = call->conn->trans->peer; | |
547 | if (mtu < peer->maxdata) { | |
548 | spin_lock_bh(&peer->lock); | |
549 | peer->maxdata = mtu; | |
550 | peer->mtu = mtu + peer->hdrsize; | |
551 | spin_unlock_bh(&peer->lock); | |
552 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
553 | } | |
554 | } | |
555 | ||
17926a79 DH |
556 | /* |
557 | * process packets in the reception queue | |
558 | */ | |
559 | static int rxrpc_process_rx_queue(struct rxrpc_call *call, | |
560 | u32 *_abort_code) | |
561 | { | |
562 | struct rxrpc_ackpacket ack; | |
563 | struct rxrpc_skb_priv *sp; | |
564 | struct sk_buff *skb; | |
565 | bool post_ACK; | |
566 | int latest; | |
567 | u32 hard, tx; | |
568 | ||
569 | _enter(""); | |
570 | ||
571 | process_further: | |
572 | skb = skb_dequeue(&call->rx_queue); | |
573 | if (!skb) | |
574 | return -EAGAIN; | |
575 | ||
576 | _net("deferred skb %p", skb); | |
577 | ||
578 | sp = rxrpc_skb(skb); | |
579 | ||
580 | _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state); | |
581 | ||
582 | post_ACK = false; | |
583 | ||
584 | switch (sp->hdr.type) { | |
585 | /* data packets that wind up here have been received out of | |
586 | * order, need security processing or are jumbo packets */ | |
587 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 588 | _proto("OOSQ DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 DH |
589 | |
590 | /* secured packets must be verified and possibly decrypted */ | |
e0e4d82f DH |
591 | if (call->conn->security->verify_packet(call, skb, |
592 | _abort_code) < 0) | |
17926a79 DH |
593 | goto protocol_error; |
594 | ||
595 | rxrpc_insert_oos_packet(call, skb); | |
596 | goto process_further; | |
597 | ||
598 | /* partial ACK to process */ | |
599 | case RXRPC_PACKET_TYPE_ACK: | |
600 | if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) { | |
601 | _debug("extraction failure"); | |
602 | goto protocol_error; | |
603 | } | |
604 | if (!skb_pull(skb, sizeof(ack))) | |
605 | BUG(); | |
606 | ||
0d12f8a4 | 607 | latest = sp->hdr.serial; |
17926a79 DH |
608 | hard = ntohl(ack.firstPacket); |
609 | tx = atomic_read(&call->sequence); | |
610 | ||
611 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
612 | latest, | |
613 | ntohs(ack.maxSkew), | |
614 | hard, | |
615 | ntohl(ack.previousPacket), | |
616 | ntohl(ack.serial), | |
08d4d217 | 617 | rxrpc_acks(ack.reason), |
17926a79 DH |
618 | ack.nAcks); |
619 | ||
224711df DH |
620 | rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks); |
621 | ||
17926a79 DH |
622 | if (ack.reason == RXRPC_ACK_PING) { |
623 | _proto("Rx ACK %%%u PING Request", latest); | |
624 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
625 | sp->hdr.serial, true); | |
626 | } | |
627 | ||
628 | /* discard any out-of-order or duplicate ACKs */ | |
629 | if (latest - call->acks_latest <= 0) { | |
630 | _debug("discard ACK %d <= %d", | |
631 | latest, call->acks_latest); | |
632 | goto discard; | |
633 | } | |
634 | call->acks_latest = latest; | |
635 | ||
636 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
637 | call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
638 | call->state != RXRPC_CALL_SERVER_SEND_REPLY && | |
639 | call->state != RXRPC_CALL_SERVER_AWAIT_ACK) | |
640 | goto discard; | |
641 | ||
642 | _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state); | |
643 | ||
644 | if (hard > 0) { | |
645 | if (hard - 1 > tx) { | |
646 | _debug("hard-ACK'd packet %d not transmitted" | |
647 | " (%d top)", | |
648 | hard - 1, tx); | |
649 | goto protocol_error; | |
650 | } | |
651 | ||
652 | if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY || | |
653 | call->state == RXRPC_CALL_SERVER_AWAIT_ACK) && | |
33c40e24 DH |
654 | hard > tx) { |
655 | call->acks_hard = tx; | |
17926a79 | 656 | goto all_acked; |
33c40e24 | 657 | } |
17926a79 DH |
658 | |
659 | smp_rmb(); | |
660 | rxrpc_rotate_tx_window(call, hard - 1); | |
661 | } | |
662 | ||
663 | if (ack.nAcks > 0) { | |
664 | if (hard - 1 + ack.nAcks > tx) { | |
665 | _debug("soft-ACK'd packet %d+%d not" | |
666 | " transmitted (%d top)", | |
667 | hard - 1, ack.nAcks, tx); | |
668 | goto protocol_error; | |
669 | } | |
670 | ||
671 | if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0) | |
672 | goto protocol_error; | |
673 | } | |
674 | goto discard; | |
675 | ||
676 | /* complete ACK to process */ | |
677 | case RXRPC_PACKET_TYPE_ACKALL: | |
678 | goto all_acked; | |
679 | ||
680 | /* abort and busy are handled elsewhere */ | |
681 | case RXRPC_PACKET_TYPE_BUSY: | |
682 | case RXRPC_PACKET_TYPE_ABORT: | |
683 | BUG(); | |
684 | ||
685 | /* connection level events - also handled elsewhere */ | |
686 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
687 | case RXRPC_PACKET_TYPE_RESPONSE: | |
688 | case RXRPC_PACKET_TYPE_DEBUG: | |
689 | BUG(); | |
690 | } | |
691 | ||
692 | /* if we've had a hard ACK that covers all the packets we've sent, then | |
693 | * that ends that phase of the operation */ | |
694 | all_acked: | |
695 | write_lock_bh(&call->state_lock); | |
696 | _debug("ack all %d", call->state); | |
697 | ||
698 | switch (call->state) { | |
699 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
700 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
701 | break; | |
702 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
703 | _debug("srv complete"); | |
704 | call->state = RXRPC_CALL_COMPLETE; | |
705 | post_ACK = true; | |
706 | break; | |
707 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
708 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
709 | goto protocol_error_unlock; /* can't occur yet */ | |
710 | default: | |
711 | write_unlock_bh(&call->state_lock); | |
712 | goto discard; /* assume packet left over from earlier phase */ | |
713 | } | |
714 | ||
715 | write_unlock_bh(&call->state_lock); | |
716 | ||
717 | /* if all the packets we sent are hard-ACK'd, then we can discard | |
718 | * whatever we've got left */ | |
719 | _debug("clear Tx %d", | |
720 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
721 | ||
722 | del_timer_sync(&call->resend_timer); | |
723 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
4c198ad1 | 724 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
17926a79 DH |
725 | |
726 | if (call->acks_window) | |
727 | rxrpc_zap_tx_window(call); | |
728 | ||
729 | if (post_ACK) { | |
730 | /* post the final ACK message for userspace to pick up */ | |
731 | _debug("post ACK"); | |
732 | skb->mark = RXRPC_SKB_MARK_FINAL_ACK; | |
733 | sp->call = call; | |
734 | rxrpc_get_call(call); | |
735 | spin_lock_bh(&call->lock); | |
736 | if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0) | |
737 | BUG(); | |
738 | spin_unlock_bh(&call->lock); | |
739 | goto process_further; | |
740 | } | |
741 | ||
742 | discard: | |
743 | rxrpc_free_skb(skb); | |
744 | goto process_further; | |
745 | ||
746 | protocol_error_unlock: | |
747 | write_unlock_bh(&call->state_lock); | |
748 | protocol_error: | |
749 | rxrpc_free_skb(skb); | |
750 | _leave(" = -EPROTO"); | |
751 | return -EPROTO; | |
752 | } | |
753 | ||
754 | /* | |
755 | * post a message to the socket Rx queue for recvmsg() to pick up | |
756 | */ | |
757 | static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, | |
758 | bool fatal) | |
759 | { | |
760 | struct rxrpc_skb_priv *sp; | |
761 | struct sk_buff *skb; | |
762 | int ret; | |
763 | ||
764 | _enter("{%d,%lx},%u,%u,%d", | |
765 | call->debug_id, call->flags, mark, error, fatal); | |
766 | ||
767 | /* remove timers and things for fatal messages */ | |
768 | if (fatal) { | |
769 | del_timer_sync(&call->resend_timer); | |
770 | del_timer_sync(&call->ack_timer); | |
771 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
772 | } | |
773 | ||
774 | if (mark != RXRPC_SKB_MARK_NEW_CALL && | |
775 | !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
776 | _leave("[no userid]"); | |
777 | return 0; | |
778 | } | |
779 | ||
780 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
781 | skb = alloc_skb(0, GFP_NOFS); | |
782 | if (!skb) | |
783 | return -ENOMEM; | |
784 | ||
785 | rxrpc_new_skb(skb); | |
786 | ||
787 | skb->mark = mark; | |
788 | ||
789 | sp = rxrpc_skb(skb); | |
790 | memset(sp, 0, sizeof(*sp)); | |
791 | sp->error = error; | |
792 | sp->call = call; | |
793 | rxrpc_get_call(call); | |
794 | ||
795 | spin_lock_bh(&call->lock); | |
796 | ret = rxrpc_queue_rcv_skb(call, skb, true, fatal); | |
797 | spin_unlock_bh(&call->lock); | |
163e3cb7 | 798 | BUG_ON(ret < 0); |
17926a79 DH |
799 | } |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
804 | /* | |
805 | * handle background processing of incoming call packets and ACK / abort | |
806 | * generation | |
807 | */ | |
808 | void rxrpc_process_call(struct work_struct *work) | |
809 | { | |
810 | struct rxrpc_call *call = | |
811 | container_of(work, struct rxrpc_call, processor); | |
0d12f8a4 | 812 | struct rxrpc_wire_header whdr; |
17926a79 DH |
813 | struct rxrpc_ackpacket ack; |
814 | struct rxrpc_ackinfo ackinfo; | |
17926a79 DH |
815 | struct msghdr msg; |
816 | struct kvec iov[5]; | |
5b8848d1 | 817 | enum rxrpc_call_event genbit; |
17926a79 | 818 | unsigned long bits; |
224711df | 819 | __be32 data, pad; |
17926a79 | 820 | size_t len; |
5b8848d1 | 821 | int loop, nbit, ioc, ret, mtu; |
0d12f8a4 | 822 | u32 serial, abort_code = RX_PROTOCOL_ERROR; |
17926a79 DH |
823 | u8 *acks = NULL; |
824 | ||
825 | //printk("\n--------------------\n"); | |
826 | _enter("{%d,%s,%lx} [%lu]", | |
827 | call->debug_id, rxrpc_call_states[call->state], call->events, | |
828 | (jiffies - call->creation_jif) / (HZ / 10)); | |
829 | ||
830 | if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) { | |
831 | _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX"); | |
832 | return; | |
833 | } | |
834 | ||
835 | /* there's a good chance we're going to have to send a message, so set | |
836 | * one up in advance */ | |
6dd050f8 DH |
837 | msg.msg_name = &call->conn->trans->peer->srx.transport; |
838 | msg.msg_namelen = call->conn->trans->peer->srx.transport_len; | |
17926a79 DH |
839 | msg.msg_control = NULL; |
840 | msg.msg_controllen = 0; | |
841 | msg.msg_flags = 0; | |
842 | ||
0d12f8a4 DH |
843 | whdr.epoch = htonl(call->conn->epoch); |
844 | whdr.cid = htonl(call->cid); | |
845 | whdr.callNumber = htonl(call->call_id); | |
846 | whdr.seq = 0; | |
847 | whdr.type = RXRPC_PACKET_TYPE_ACK; | |
848 | whdr.flags = call->conn->out_clientflag; | |
849 | whdr.userStatus = 0; | |
850 | whdr.securityIndex = call->conn->security_ix; | |
851 | whdr._rsvd = 0; | |
852 | whdr.serviceId = htons(call->service_id); | |
17926a79 DH |
853 | |
854 | memset(iov, 0, sizeof(iov)); | |
0d12f8a4 DH |
855 | iov[0].iov_base = &whdr; |
856 | iov[0].iov_len = sizeof(whdr); | |
17926a79 DH |
857 | |
858 | /* deal with events of a final nature */ | |
4c198ad1 | 859 | if (test_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 | 860 | rxrpc_release_call(call); |
4c198ad1 | 861 | clear_bit(RXRPC_CALL_EV_RELEASE, &call->events); |
17926a79 DH |
862 | } |
863 | ||
4c198ad1 | 864 | if (test_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events)) { |
17926a79 DH |
865 | int error; |
866 | ||
4c198ad1 DH |
867 | clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
868 | clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events); | |
869 | clear_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
17926a79 DH |
870 | |
871 | error = call->conn->trans->peer->net_error; | |
872 | _debug("post net error %d", error); | |
873 | ||
874 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR, | |
875 | error, true) < 0) | |
876 | goto no_mem; | |
4c198ad1 | 877 | clear_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events); |
17926a79 DH |
878 | goto kill_ACKs; |
879 | } | |
880 | ||
4c198ad1 | 881 | if (test_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events)) { |
17926a79 DH |
882 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); |
883 | ||
4c198ad1 DH |
884 | clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events); |
885 | clear_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
17926a79 DH |
886 | |
887 | _debug("post conn abort"); | |
888 | ||
889 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
890 | call->conn->error, true) < 0) | |
891 | goto no_mem; | |
4c198ad1 | 892 | clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
17926a79 DH |
893 | goto kill_ACKs; |
894 | } | |
895 | ||
4c198ad1 | 896 | if (test_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events)) { |
0d12f8a4 | 897 | whdr.type = RXRPC_PACKET_TYPE_BUSY; |
4c198ad1 | 898 | genbit = RXRPC_CALL_EV_REJECT_BUSY; |
17926a79 DH |
899 | goto send_message; |
900 | } | |
901 | ||
4c198ad1 | 902 | if (test_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
17926a79 DH |
903 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); |
904 | ||
905 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
906 | ECONNABORTED, true) < 0) | |
907 | goto no_mem; | |
0d12f8a4 | 908 | whdr.type = RXRPC_PACKET_TYPE_ABORT; |
dc44b3a0 | 909 | data = htonl(call->local_abort); |
17926a79 DH |
910 | iov[1].iov_base = &data; |
911 | iov[1].iov_len = sizeof(data); | |
4c198ad1 | 912 | genbit = RXRPC_CALL_EV_ABORT; |
17926a79 DH |
913 | goto send_message; |
914 | } | |
915 | ||
4c198ad1 DH |
916 | if (test_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events)) { |
917 | genbit = RXRPC_CALL_EV_ACK_FINAL; | |
224711df DH |
918 | |
919 | ack.bufferSpace = htons(8); | |
920 | ack.maxSkew = 0; | |
921 | ack.serial = 0; | |
922 | ack.reason = RXRPC_ACK_IDLE; | |
923 | ack.nAcks = 0; | |
924 | call->ackr_reason = 0; | |
925 | ||
926 | spin_lock_bh(&call->lock); | |
0d12f8a4 DH |
927 | ack.serial = htonl(call->ackr_serial); |
928 | ack.previousPacket = htonl(call->ackr_prev_seq); | |
929 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
224711df DH |
930 | spin_unlock_bh(&call->lock); |
931 | ||
932 | pad = 0; | |
933 | ||
934 | iov[1].iov_base = &ack; | |
935 | iov[1].iov_len = sizeof(ack); | |
936 | iov[2].iov_base = &pad; | |
937 | iov[2].iov_len = 3; | |
938 | iov[3].iov_base = &ackinfo; | |
939 | iov[3].iov_len = sizeof(ackinfo); | |
940 | goto send_ACK; | |
17926a79 DH |
941 | } |
942 | ||
4c198ad1 DH |
943 | if (call->events & ((1 << RXRPC_CALL_EV_RCVD_BUSY) | |
944 | (1 << RXRPC_CALL_EV_RCVD_ABORT)) | |
17926a79 DH |
945 | ) { |
946 | u32 mark; | |
947 | ||
4c198ad1 | 948 | if (test_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events)) |
17926a79 DH |
949 | mark = RXRPC_SKB_MARK_REMOTE_ABORT; |
950 | else | |
951 | mark = RXRPC_SKB_MARK_BUSY; | |
952 | ||
953 | _debug("post abort/busy"); | |
954 | rxrpc_clear_tx_window(call); | |
955 | if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0) | |
956 | goto no_mem; | |
957 | ||
4c198ad1 DH |
958 | clear_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
959 | clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); | |
17926a79 DH |
960 | goto kill_ACKs; |
961 | } | |
962 | ||
4c198ad1 | 963 | if (test_and_clear_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events)) { |
17926a79 DH |
964 | _debug("do implicit ackall"); |
965 | rxrpc_clear_tx_window(call); | |
966 | } | |
967 | ||
4c198ad1 | 968 | if (test_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events)) { |
17926a79 DH |
969 | write_lock_bh(&call->state_lock); |
970 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
971 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 972 | call->local_abort = RX_CALL_TIMEOUT; |
4c198ad1 | 973 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
17926a79 DH |
974 | } |
975 | write_unlock_bh(&call->state_lock); | |
976 | ||
977 | _debug("post timeout"); | |
978 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
979 | ETIME, true) < 0) | |
980 | goto no_mem; | |
981 | ||
4c198ad1 | 982 | clear_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events); |
17926a79 DH |
983 | goto kill_ACKs; |
984 | } | |
985 | ||
986 | /* deal with assorted inbound messages */ | |
987 | if (!skb_queue_empty(&call->rx_queue)) { | |
988 | switch (rxrpc_process_rx_queue(call, &abort_code)) { | |
989 | case 0: | |
990 | case -EAGAIN: | |
991 | break; | |
992 | case -ENOMEM: | |
993 | goto no_mem; | |
994 | case -EKEYEXPIRED: | |
995 | case -EKEYREJECTED: | |
996 | case -EPROTO: | |
997 | rxrpc_abort_call(call, abort_code); | |
998 | goto kill_ACKs; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | /* handle resending */ | |
4c198ad1 | 1003 | if (test_and_clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events)) |
17926a79 | 1004 | rxrpc_resend_timer(call); |
4c198ad1 | 1005 | if (test_and_clear_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
17926a79 DH |
1006 | rxrpc_resend(call); |
1007 | ||
1008 | /* consider sending an ordinary ACK */ | |
4c198ad1 | 1009 | if (test_bit(RXRPC_CALL_EV_ACK, &call->events)) { |
17926a79 DH |
1010 | _debug("send ACK: window: %d - %d { %lx }", |
1011 | call->rx_data_eaten, call->ackr_win_top, | |
1012 | call->ackr_window[0]); | |
1013 | ||
1014 | if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST && | |
1015 | call->ackr_reason != RXRPC_ACK_PING_RESPONSE) { | |
1016 | /* ACK by sending reply DATA packet in this state */ | |
4c198ad1 | 1017 | clear_bit(RXRPC_CALL_EV_ACK, &call->events); |
17926a79 DH |
1018 | goto maybe_reschedule; |
1019 | } | |
1020 | ||
4c198ad1 | 1021 | genbit = RXRPC_CALL_EV_ACK; |
17926a79 DH |
1022 | |
1023 | acks = kzalloc(call->ackr_win_top - call->rx_data_eaten, | |
1024 | GFP_NOFS); | |
1025 | if (!acks) | |
1026 | goto no_mem; | |
1027 | ||
1028 | //hdr.flags = RXRPC_SLOW_START_OK; | |
1029 | ack.bufferSpace = htons(8); | |
1030 | ack.maxSkew = 0; | |
17926a79 | 1031 | |
17926a79 | 1032 | spin_lock_bh(&call->lock); |
0d12f8a4 DH |
1033 | ack.reason = call->ackr_reason; |
1034 | ack.serial = htonl(call->ackr_serial); | |
1035 | ack.previousPacket = htonl(call->ackr_prev_seq); | |
17926a79 DH |
1036 | ack.firstPacket = htonl(call->rx_data_eaten + 1); |
1037 | ||
1038 | ack.nAcks = 0; | |
1039 | for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { | |
1040 | nbit = loop * BITS_PER_LONG; | |
1041 | for (bits = call->ackr_window[loop]; bits; bits >>= 1 | |
1042 | ) { | |
1043 | _debug("- l=%d n=%d b=%lx", loop, nbit, bits); | |
1044 | if (bits & 1) { | |
1045 | acks[nbit] = RXRPC_ACK_TYPE_ACK; | |
1046 | ack.nAcks = nbit + 1; | |
1047 | } | |
1048 | nbit++; | |
1049 | } | |
1050 | } | |
1051 | call->ackr_reason = 0; | |
1052 | spin_unlock_bh(&call->lock); | |
1053 | ||
1054 | pad = 0; | |
1055 | ||
1056 | iov[1].iov_base = &ack; | |
1057 | iov[1].iov_len = sizeof(ack); | |
1058 | iov[2].iov_base = acks; | |
1059 | iov[2].iov_len = ack.nAcks; | |
1060 | iov[3].iov_base = &pad; | |
1061 | iov[3].iov_len = 3; | |
1062 | iov[4].iov_base = &ackinfo; | |
1063 | iov[4].iov_len = sizeof(ackinfo); | |
1064 | ||
1065 | switch (ack.reason) { | |
1066 | case RXRPC_ACK_REQUESTED: | |
1067 | case RXRPC_ACK_DUPLICATE: | |
1068 | case RXRPC_ACK_OUT_OF_SEQUENCE: | |
1069 | case RXRPC_ACK_EXCEEDS_WINDOW: | |
1070 | case RXRPC_ACK_NOSPACE: | |
1071 | case RXRPC_ACK_PING: | |
1072 | case RXRPC_ACK_PING_RESPONSE: | |
1073 | goto send_ACK_with_skew; | |
1074 | case RXRPC_ACK_DELAY: | |
1075 | case RXRPC_ACK_IDLE: | |
1076 | goto send_ACK; | |
1077 | } | |
1078 | } | |
1079 | ||
1080 | /* handle completion of security negotiations on an incoming | |
1081 | * connection */ | |
4c198ad1 | 1082 | if (test_and_clear_bit(RXRPC_CALL_EV_SECURED, &call->events)) { |
17926a79 DH |
1083 | _debug("secured"); |
1084 | spin_lock_bh(&call->lock); | |
1085 | ||
1086 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
1087 | _debug("securing"); | |
1088 | write_lock(&call->conn->lock); | |
1089 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 1090 | !test_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 DH |
1091 | _debug("not released"); |
1092 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
1093 | list_move_tail(&call->accept_link, | |
1094 | &call->socket->acceptq); | |
1095 | } | |
1096 | write_unlock(&call->conn->lock); | |
1097 | read_lock(&call->state_lock); | |
1098 | if (call->state < RXRPC_CALL_COMPLETE) | |
4c198ad1 | 1099 | set_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events); |
17926a79 DH |
1100 | read_unlock(&call->state_lock); |
1101 | } | |
1102 | ||
1103 | spin_unlock_bh(&call->lock); | |
4c198ad1 | 1104 | if (!test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) |
17926a79 DH |
1105 | goto maybe_reschedule; |
1106 | } | |
1107 | ||
1108 | /* post a notification of an acceptable connection to the app */ | |
4c198ad1 | 1109 | if (test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) { |
17926a79 DH |
1110 | _debug("post accept"); |
1111 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL, | |
1112 | 0, false) < 0) | |
1113 | goto no_mem; | |
4c198ad1 | 1114 | clear_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events); |
17926a79 DH |
1115 | goto maybe_reschedule; |
1116 | } | |
1117 | ||
1118 | /* handle incoming call acceptance */ | |
4c198ad1 | 1119 | if (test_and_clear_bit(RXRPC_CALL_EV_ACCEPTED, &call->events)) { |
17926a79 DH |
1120 | _debug("accepted"); |
1121 | ASSERTCMP(call->rx_data_post, ==, 0); | |
1122 | call->rx_data_post = 1; | |
1123 | read_lock_bh(&call->state_lock); | |
1124 | if (call->state < RXRPC_CALL_COMPLETE) | |
4c198ad1 | 1125 | set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events); |
17926a79 DH |
1126 | read_unlock_bh(&call->state_lock); |
1127 | } | |
1128 | ||
1129 | /* drain the out of sequence received packet queue into the packet Rx | |
1130 | * queue */ | |
4c198ad1 | 1131 | if (test_and_clear_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) { |
17926a79 DH |
1132 | while (call->rx_data_post == call->rx_first_oos) |
1133 | if (rxrpc_drain_rx_oos_queue(call) < 0) | |
1134 | break; | |
1135 | goto maybe_reschedule; | |
1136 | } | |
1137 | ||
1138 | /* other events may have been raised since we started checking */ | |
1139 | goto maybe_reschedule; | |
1140 | ||
1141 | send_ACK_with_skew: | |
1142 | ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) - | |
1143 | ntohl(ack.serial)); | |
1144 | send_ACK: | |
224711df DH |
1145 | mtu = call->conn->trans->peer->if_mtu; |
1146 | mtu -= call->conn->trans->peer->hdrsize; | |
1147 | ackinfo.maxMTU = htonl(mtu); | |
817913d8 | 1148 | ackinfo.rwind = htonl(rxrpc_rx_window_size); |
224711df DH |
1149 | |
1150 | /* permit the peer to send us jumbo packets if it wants to */ | |
817913d8 DH |
1151 | ackinfo.rxMTU = htonl(rxrpc_rx_mtu); |
1152 | ackinfo.jumbo_max = htonl(rxrpc_rx_jumbo_max); | |
224711df | 1153 | |
0d12f8a4 DH |
1154 | serial = atomic_inc_return(&call->conn->serial); |
1155 | whdr.serial = htonl(serial); | |
17926a79 | 1156 | _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", |
0d12f8a4 | 1157 | serial, |
17926a79 DH |
1158 | ntohs(ack.maxSkew), |
1159 | ntohl(ack.firstPacket), | |
1160 | ntohl(ack.previousPacket), | |
1161 | ntohl(ack.serial), | |
08d4d217 | 1162 | rxrpc_acks(ack.reason), |
17926a79 DH |
1163 | ack.nAcks); |
1164 | ||
1165 | del_timer_sync(&call->ack_timer); | |
1166 | if (ack.nAcks > 0) | |
1167 | set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags); | |
1168 | goto send_message_2; | |
1169 | ||
1170 | send_message: | |
1171 | _debug("send message"); | |
1172 | ||
0d12f8a4 DH |
1173 | serial = atomic_inc_return(&call->conn->serial); |
1174 | whdr.serial = htonl(serial); | |
1175 | _proto("Tx %s %%%u", rxrpc_pkts[whdr.type], serial); | |
17926a79 DH |
1176 | send_message_2: |
1177 | ||
1178 | len = iov[0].iov_len; | |
1179 | ioc = 1; | |
1180 | if (iov[4].iov_len) { | |
1181 | ioc = 5; | |
1182 | len += iov[4].iov_len; | |
1183 | len += iov[3].iov_len; | |
1184 | len += iov[2].iov_len; | |
1185 | len += iov[1].iov_len; | |
1186 | } else if (iov[3].iov_len) { | |
1187 | ioc = 4; | |
1188 | len += iov[3].iov_len; | |
1189 | len += iov[2].iov_len; | |
1190 | len += iov[1].iov_len; | |
1191 | } else if (iov[2].iov_len) { | |
1192 | ioc = 3; | |
1193 | len += iov[2].iov_len; | |
1194 | len += iov[1].iov_len; | |
1195 | } else if (iov[1].iov_len) { | |
1196 | ioc = 2; | |
1197 | len += iov[1].iov_len; | |
1198 | } | |
1199 | ||
1200 | ret = kernel_sendmsg(call->conn->trans->local->socket, | |
1201 | &msg, iov, ioc, len); | |
1202 | if (ret < 0) { | |
1203 | _debug("sendmsg failed: %d", ret); | |
1204 | read_lock_bh(&call->state_lock); | |
1205 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1206 | rxrpc_queue_call(call); |
17926a79 DH |
1207 | read_unlock_bh(&call->state_lock); |
1208 | goto error; | |
1209 | } | |
1210 | ||
1211 | switch (genbit) { | |
4c198ad1 | 1212 | case RXRPC_CALL_EV_ABORT: |
17926a79 | 1213 | clear_bit(genbit, &call->events); |
4c198ad1 | 1214 | clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
17926a79 DH |
1215 | goto kill_ACKs; |
1216 | ||
4c198ad1 | 1217 | case RXRPC_CALL_EV_ACK_FINAL: |
17926a79 DH |
1218 | write_lock_bh(&call->state_lock); |
1219 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) | |
1220 | call->state = RXRPC_CALL_COMPLETE; | |
1221 | write_unlock_bh(&call->state_lock); | |
1222 | goto kill_ACKs; | |
1223 | ||
1224 | default: | |
1225 | clear_bit(genbit, &call->events); | |
1226 | switch (call->state) { | |
1227 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
1228 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
1229 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
1230 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
1231 | _debug("start ACK timer"); | |
1232 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, | |
1233 | call->ackr_serial, false); | |
1234 | default: | |
1235 | break; | |
1236 | } | |
1237 | goto maybe_reschedule; | |
1238 | } | |
1239 | ||
1240 | kill_ACKs: | |
1241 | del_timer_sync(&call->ack_timer); | |
4c198ad1 | 1242 | if (test_and_clear_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events)) |
17926a79 | 1243 | rxrpc_put_call(call); |
4c198ad1 | 1244 | clear_bit(RXRPC_CALL_EV_ACK, &call->events); |
17926a79 DH |
1245 | |
1246 | maybe_reschedule: | |
1247 | if (call->events || !skb_queue_empty(&call->rx_queue)) { | |
1248 | read_lock_bh(&call->state_lock); | |
1249 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1250 | rxrpc_queue_call(call); |
17926a79 DH |
1251 | read_unlock_bh(&call->state_lock); |
1252 | } | |
1253 | ||
1254 | /* don't leave aborted connections on the accept queue */ | |
1255 | if (call->state >= RXRPC_CALL_COMPLETE && | |
1256 | !list_empty(&call->accept_link)) { | |
1257 | _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }", | |
0d12f8a4 | 1258 | call, call->events, call->flags, call->conn->cid); |
17926a79 DH |
1259 | |
1260 | read_lock_bh(&call->state_lock); | |
1261 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 1262 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 | 1263 | rxrpc_queue_call(call); |
17926a79 DH |
1264 | read_unlock_bh(&call->state_lock); |
1265 | } | |
1266 | ||
1267 | error: | |
1268 | clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags); | |
1269 | kfree(acks); | |
1270 | ||
1271 | /* because we don't want two CPUs both processing the work item for one | |
1272 | * call at the same time, we use a flag to note when it's busy; however | |
1273 | * this means there's a race between clearing the flag and setting the | |
1274 | * work pending bit and the work item being processed again */ | |
1275 | if (call->events && !work_pending(&call->processor)) { | |
0d12f8a4 | 1276 | _debug("jumpstart %x", call->conn->cid); |
651350d1 | 1277 | rxrpc_queue_call(call); |
17926a79 DH |
1278 | } |
1279 | ||
1280 | _leave(""); | |
1281 | return; | |
1282 | ||
1283 | no_mem: | |
1284 | _debug("out of memory"); | |
1285 | goto maybe_reschedule; | |
1286 | } |