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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 | ||
95c96174 | 22 | static unsigned int rxrpc_ack_defer = 1; |
17926a79 | 23 | |
08d4d217 DC |
24 | static const char *rxrpc_acks(u8 reason) |
25 | { | |
26 | static const char *const str[] = { | |
27 | "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", | |
28 | "IDL", "-?-" | |
29 | }; | |
30 | ||
31 | if (reason >= ARRAY_SIZE(str)) | |
32 | reason = ARRAY_SIZE(str) - 1; | |
33 | return str[reason]; | |
34 | } | |
17926a79 DH |
35 | |
36 | static const s8 rxrpc_ack_priority[] = { | |
37 | [0] = 0, | |
38 | [RXRPC_ACK_DELAY] = 1, | |
39 | [RXRPC_ACK_REQUESTED] = 2, | |
40 | [RXRPC_ACK_IDLE] = 3, | |
41 | [RXRPC_ACK_PING_RESPONSE] = 4, | |
42 | [RXRPC_ACK_DUPLICATE] = 5, | |
43 | [RXRPC_ACK_OUT_OF_SEQUENCE] = 6, | |
44 | [RXRPC_ACK_EXCEEDS_WINDOW] = 7, | |
45 | [RXRPC_ACK_NOSPACE] = 8, | |
46 | }; | |
47 | ||
48 | /* | |
49 | * propose an ACK be sent | |
50 | */ | |
4e36a95e | 51 | void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
17926a79 DH |
52 | __be32 serial, bool immediate) |
53 | { | |
54 | unsigned long expiry; | |
55 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
56 | ||
57 | ASSERTCMP(prior, >, 0); | |
58 | ||
59 | _enter("{%d},%s,%%%x,%u", | |
08d4d217 | 60 | call->debug_id, rxrpc_acks(ack_reason), ntohl(serial), |
17926a79 DH |
61 | immediate); |
62 | ||
63 | if (prior < rxrpc_ack_priority[call->ackr_reason]) { | |
64 | if (immediate) | |
65 | goto cancel_timer; | |
66 | return; | |
67 | } | |
68 | ||
69 | /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial | |
70 | * numbers */ | |
71 | if (prior == rxrpc_ack_priority[call->ackr_reason]) { | |
72 | if (prior <= 4) | |
73 | call->ackr_serial = serial; | |
74 | if (immediate) | |
75 | goto cancel_timer; | |
76 | return; | |
77 | } | |
78 | ||
79 | call->ackr_reason = ack_reason; | |
80 | call->ackr_serial = serial; | |
81 | ||
82 | switch (ack_reason) { | |
83 | case RXRPC_ACK_DELAY: | |
84 | _debug("run delay timer"); | |
85 | call->ack_timer.expires = jiffies + rxrpc_ack_timeout * HZ; | |
86 | add_timer(&call->ack_timer); | |
87 | return; | |
88 | ||
89 | case RXRPC_ACK_IDLE: | |
90 | if (!immediate) { | |
91 | _debug("run defer timer"); | |
92 | expiry = 1; | |
93 | goto run_timer; | |
94 | } | |
95 | goto cancel_timer; | |
96 | ||
97 | case RXRPC_ACK_REQUESTED: | |
98 | if (!rxrpc_ack_defer) | |
99 | goto cancel_timer; | |
100 | if (!immediate || serial == cpu_to_be32(1)) { | |
101 | _debug("run defer timer"); | |
102 | expiry = rxrpc_ack_defer; | |
103 | goto run_timer; | |
104 | } | |
105 | ||
106 | default: | |
107 | _debug("immediate ACK"); | |
108 | goto cancel_timer; | |
109 | } | |
110 | ||
111 | run_timer: | |
112 | expiry += jiffies; | |
113 | if (!timer_pending(&call->ack_timer) || | |
114 | time_after(call->ack_timer.expires, expiry)) | |
115 | mod_timer(&call->ack_timer, expiry); | |
116 | return; | |
117 | ||
118 | cancel_timer: | |
119 | _debug("cancel timer %%%u", ntohl(serial)); | |
120 | try_to_del_timer_sync(&call->ack_timer); | |
121 | read_lock_bh(&call->state_lock); | |
122 | if (call->state <= RXRPC_CALL_COMPLETE && | |
123 | !test_and_set_bit(RXRPC_CALL_ACK, &call->events)) | |
651350d1 | 124 | rxrpc_queue_call(call); |
17926a79 DH |
125 | read_unlock_bh(&call->state_lock); |
126 | } | |
127 | ||
128 | /* | |
129 | * propose an ACK be sent, locking the call structure | |
130 | */ | |
4e36a95e | 131 | void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
17926a79 DH |
132 | __be32 serial, bool immediate) |
133 | { | |
134 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
135 | ||
136 | if (prior > rxrpc_ack_priority[call->ackr_reason]) { | |
137 | spin_lock_bh(&call->lock); | |
138 | __rxrpc_propose_ACK(call, ack_reason, serial, immediate); | |
139 | spin_unlock_bh(&call->lock); | |
140 | } | |
141 | } | |
142 | ||
143 | /* | |
144 | * set the resend timer | |
145 | */ | |
146 | static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend, | |
147 | unsigned long resend_at) | |
148 | { | |
149 | read_lock_bh(&call->state_lock); | |
150 | if (call->state >= RXRPC_CALL_COMPLETE) | |
151 | resend = 0; | |
152 | ||
153 | if (resend & 1) { | |
154 | _debug("SET RESEND"); | |
155 | set_bit(RXRPC_CALL_RESEND, &call->events); | |
156 | } | |
157 | ||
158 | if (resend & 2) { | |
159 | _debug("MODIFY RESEND TIMER"); | |
160 | set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
161 | mod_timer(&call->resend_timer, resend_at); | |
162 | } else { | |
163 | _debug("KILL RESEND TIMER"); | |
164 | del_timer_sync(&call->resend_timer); | |
165 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
166 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
167 | } | |
168 | read_unlock_bh(&call->state_lock); | |
169 | } | |
170 | ||
171 | /* | |
172 | * resend packets | |
173 | */ | |
174 | static void rxrpc_resend(struct rxrpc_call *call) | |
175 | { | |
176 | struct rxrpc_skb_priv *sp; | |
177 | struct rxrpc_header *hdr; | |
178 | struct sk_buff *txb; | |
179 | unsigned long *p_txb, resend_at; | |
180 | int loop, stop; | |
181 | u8 resend; | |
182 | ||
183 | _enter("{%d,%d,%d,%d},", | |
184 | call->acks_hard, call->acks_unacked, | |
185 | atomic_read(&call->sequence), | |
186 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
187 | ||
188 | stop = 0; | |
189 | resend = 0; | |
190 | resend_at = 0; | |
191 | ||
192 | for (loop = call->acks_tail; | |
193 | loop != call->acks_head || stop; | |
194 | loop = (loop + 1) & (call->acks_winsz - 1) | |
195 | ) { | |
196 | p_txb = call->acks_window + loop; | |
197 | smp_read_barrier_depends(); | |
198 | if (*p_txb & 1) | |
199 | continue; | |
200 | ||
201 | txb = (struct sk_buff *) *p_txb; | |
202 | sp = rxrpc_skb(txb); | |
203 | ||
204 | if (sp->need_resend) { | |
3db1cd5c | 205 | sp->need_resend = false; |
17926a79 DH |
206 | |
207 | /* each Tx packet has a new serial number */ | |
208 | sp->hdr.serial = | |
209 | htonl(atomic_inc_return(&call->conn->serial)); | |
210 | ||
211 | hdr = (struct rxrpc_header *) txb->head; | |
212 | hdr->serial = sp->hdr.serial; | |
213 | ||
214 | _proto("Tx DATA %%%u { #%d }", | |
215 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
216 | if (rxrpc_send_packet(call->conn->trans, txb) < 0) { | |
217 | stop = 0; | |
218 | sp->resend_at = jiffies + 3; | |
219 | } else { | |
220 | sp->resend_at = | |
221 | jiffies + rxrpc_resend_timeout * HZ; | |
222 | } | |
223 | } | |
224 | ||
225 | if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 226 | sp->need_resend = true; |
17926a79 DH |
227 | resend |= 1; |
228 | } else if (resend & 2) { | |
229 | if (time_before(sp->resend_at, resend_at)) | |
230 | resend_at = sp->resend_at; | |
231 | } else { | |
232 | resend_at = sp->resend_at; | |
233 | resend |= 2; | |
234 | } | |
235 | } | |
236 | ||
237 | rxrpc_set_resend(call, resend, resend_at); | |
238 | _leave(""); | |
239 | } | |
240 | ||
241 | /* | |
242 | * handle resend timer expiry | |
243 | */ | |
244 | static void rxrpc_resend_timer(struct rxrpc_call *call) | |
245 | { | |
246 | struct rxrpc_skb_priv *sp; | |
247 | struct sk_buff *txb; | |
248 | unsigned long *p_txb, resend_at; | |
249 | int loop; | |
250 | u8 resend; | |
251 | ||
252 | _enter("%d,%d,%d", | |
253 | call->acks_tail, call->acks_unacked, call->acks_head); | |
254 | ||
3b5bac2b DH |
255 | if (call->state >= RXRPC_CALL_COMPLETE) |
256 | return; | |
257 | ||
17926a79 DH |
258 | resend = 0; |
259 | resend_at = 0; | |
260 | ||
261 | for (loop = call->acks_unacked; | |
262 | loop != call->acks_head; | |
263 | loop = (loop + 1) & (call->acks_winsz - 1) | |
264 | ) { | |
265 | p_txb = call->acks_window + loop; | |
266 | smp_read_barrier_depends(); | |
267 | txb = (struct sk_buff *) (*p_txb & ~1); | |
268 | sp = rxrpc_skb(txb); | |
269 | ||
270 | ASSERT(!(*p_txb & 1)); | |
271 | ||
272 | if (sp->need_resend) { | |
273 | ; | |
274 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 275 | sp->need_resend = true; |
17926a79 DH |
276 | resend |= 1; |
277 | } else if (resend & 2) { | |
278 | if (time_before(sp->resend_at, resend_at)) | |
279 | resend_at = sp->resend_at; | |
280 | } else { | |
281 | resend_at = sp->resend_at; | |
282 | resend |= 2; | |
283 | } | |
284 | } | |
285 | ||
286 | rxrpc_set_resend(call, resend, resend_at); | |
287 | _leave(""); | |
288 | } | |
289 | ||
290 | /* | |
291 | * process soft ACKs of our transmitted packets | |
292 | * - these indicate packets the peer has or has not received, but hasn't yet | |
293 | * given to the consumer, and so can still be discarded and re-requested | |
294 | */ | |
295 | static int rxrpc_process_soft_ACKs(struct rxrpc_call *call, | |
296 | struct rxrpc_ackpacket *ack, | |
297 | struct sk_buff *skb) | |
298 | { | |
299 | struct rxrpc_skb_priv *sp; | |
300 | struct sk_buff *txb; | |
301 | unsigned long *p_txb, resend_at; | |
302 | int loop; | |
303 | u8 sacks[RXRPC_MAXACKS], resend; | |
304 | ||
305 | _enter("{%d,%d},{%d},", | |
306 | call->acks_hard, | |
307 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz), | |
308 | ack->nAcks); | |
309 | ||
310 | if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0) | |
311 | goto protocol_error; | |
312 | ||
313 | resend = 0; | |
314 | resend_at = 0; | |
315 | for (loop = 0; loop < ack->nAcks; loop++) { | |
316 | p_txb = call->acks_window; | |
317 | p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1); | |
318 | smp_read_barrier_depends(); | |
319 | txb = (struct sk_buff *) (*p_txb & ~1); | |
320 | sp = rxrpc_skb(txb); | |
321 | ||
322 | switch (sacks[loop]) { | |
323 | case RXRPC_ACK_TYPE_ACK: | |
3db1cd5c | 324 | sp->need_resend = false; |
17926a79 DH |
325 | *p_txb |= 1; |
326 | break; | |
327 | case RXRPC_ACK_TYPE_NACK: | |
3db1cd5c | 328 | sp->need_resend = true; |
17926a79 DH |
329 | *p_txb &= ~1; |
330 | resend = 1; | |
331 | break; | |
332 | default: | |
333 | _debug("Unsupported ACK type %d", sacks[loop]); | |
334 | goto protocol_error; | |
335 | } | |
336 | } | |
337 | ||
338 | smp_mb(); | |
339 | call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1); | |
340 | ||
341 | /* anything not explicitly ACK'd is implicitly NACK'd, but may just not | |
342 | * have been received or processed yet by the far end */ | |
343 | for (loop = call->acks_unacked; | |
344 | loop != call->acks_head; | |
345 | loop = (loop + 1) & (call->acks_winsz - 1) | |
346 | ) { | |
347 | p_txb = call->acks_window + loop; | |
348 | smp_read_barrier_depends(); | |
349 | txb = (struct sk_buff *) (*p_txb & ~1); | |
350 | sp = rxrpc_skb(txb); | |
351 | ||
352 | if (*p_txb & 1) { | |
353 | /* packet must have been discarded */ | |
3db1cd5c | 354 | sp->need_resend = true; |
17926a79 DH |
355 | *p_txb &= ~1; |
356 | resend |= 1; | |
357 | } else if (sp->need_resend) { | |
358 | ; | |
359 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 360 | sp->need_resend = true; |
17926a79 DH |
361 | resend |= 1; |
362 | } else if (resend & 2) { | |
363 | if (time_before(sp->resend_at, resend_at)) | |
364 | resend_at = sp->resend_at; | |
365 | } else { | |
366 | resend_at = sp->resend_at; | |
367 | resend |= 2; | |
368 | } | |
369 | } | |
370 | ||
371 | rxrpc_set_resend(call, resend, resend_at); | |
372 | _leave(" = 0"); | |
373 | return 0; | |
374 | ||
375 | protocol_error: | |
376 | _leave(" = -EPROTO"); | |
377 | return -EPROTO; | |
378 | } | |
379 | ||
380 | /* | |
381 | * discard hard-ACK'd packets from the Tx window | |
382 | */ | |
383 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard) | |
384 | { | |
17926a79 DH |
385 | unsigned long _skb; |
386 | int tail = call->acks_tail, old_tail; | |
387 | int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz); | |
388 | ||
389 | _enter("{%u,%u},%u", call->acks_hard, win, hard); | |
390 | ||
391 | ASSERTCMP(hard - call->acks_hard, <=, win); | |
392 | ||
393 | while (call->acks_hard < hard) { | |
394 | smp_read_barrier_depends(); | |
395 | _skb = call->acks_window[tail] & ~1; | |
17926a79 DH |
396 | rxrpc_free_skb((struct sk_buff *) _skb); |
397 | old_tail = tail; | |
398 | tail = (tail + 1) & (call->acks_winsz - 1); | |
399 | call->acks_tail = tail; | |
400 | if (call->acks_unacked == old_tail) | |
401 | call->acks_unacked = tail; | |
402 | call->acks_hard++; | |
403 | } | |
404 | ||
405 | wake_up(&call->tx_waitq); | |
406 | } | |
407 | ||
408 | /* | |
409 | * clear the Tx window in the event of a failure | |
410 | */ | |
411 | static void rxrpc_clear_tx_window(struct rxrpc_call *call) | |
412 | { | |
413 | rxrpc_rotate_tx_window(call, atomic_read(&call->sequence)); | |
414 | } | |
415 | ||
416 | /* | |
417 | * drain the out of sequence received packet queue into the packet Rx queue | |
418 | */ | |
419 | static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call) | |
420 | { | |
421 | struct rxrpc_skb_priv *sp; | |
422 | struct sk_buff *skb; | |
423 | bool terminal; | |
424 | int ret; | |
425 | ||
426 | _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos); | |
427 | ||
428 | spin_lock_bh(&call->lock); | |
429 | ||
430 | ret = -ECONNRESET; | |
431 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
432 | goto socket_unavailable; | |
433 | ||
434 | skb = skb_dequeue(&call->rx_oos_queue); | |
435 | if (skb) { | |
436 | sp = rxrpc_skb(skb); | |
437 | ||
438 | _debug("drain OOS packet %d [%d]", | |
439 | ntohl(sp->hdr.seq), call->rx_first_oos); | |
440 | ||
441 | if (ntohl(sp->hdr.seq) != call->rx_first_oos) { | |
442 | skb_queue_head(&call->rx_oos_queue, skb); | |
443 | call->rx_first_oos = ntohl(rxrpc_skb(skb)->hdr.seq); | |
444 | _debug("requeue %p {%u}", skb, call->rx_first_oos); | |
445 | } else { | |
446 | skb->mark = RXRPC_SKB_MARK_DATA; | |
447 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
448 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
449 | ret = rxrpc_queue_rcv_skb(call, skb, true, terminal); | |
450 | BUG_ON(ret < 0); | |
451 | _debug("drain #%u", call->rx_data_post); | |
452 | call->rx_data_post++; | |
453 | ||
454 | /* find out what the next packet is */ | |
455 | skb = skb_peek(&call->rx_oos_queue); | |
456 | if (skb) | |
457 | call->rx_first_oos = | |
458 | ntohl(rxrpc_skb(skb)->hdr.seq); | |
459 | else | |
460 | call->rx_first_oos = 0; | |
461 | _debug("peek %p {%u}", skb, call->rx_first_oos); | |
462 | } | |
463 | } | |
464 | ||
465 | ret = 0; | |
466 | socket_unavailable: | |
467 | spin_unlock_bh(&call->lock); | |
468 | _leave(" = %d", ret); | |
469 | return ret; | |
470 | } | |
471 | ||
472 | /* | |
473 | * insert an out of sequence packet into the buffer | |
474 | */ | |
475 | static void rxrpc_insert_oos_packet(struct rxrpc_call *call, | |
476 | struct sk_buff *skb) | |
477 | { | |
478 | struct rxrpc_skb_priv *sp, *psp; | |
479 | struct sk_buff *p; | |
480 | u32 seq; | |
481 | ||
482 | sp = rxrpc_skb(skb); | |
483 | seq = ntohl(sp->hdr.seq); | |
484 | _enter(",,{%u}", seq); | |
485 | ||
486 | skb->destructor = rxrpc_packet_destructor; | |
487 | ASSERTCMP(sp->call, ==, NULL); | |
488 | sp->call = call; | |
489 | rxrpc_get_call(call); | |
490 | ||
491 | /* insert into the buffer in sequence order */ | |
492 | spin_lock_bh(&call->lock); | |
493 | ||
494 | skb_queue_walk(&call->rx_oos_queue, p) { | |
495 | psp = rxrpc_skb(p); | |
496 | if (ntohl(psp->hdr.seq) > seq) { | |
497 | _debug("insert oos #%u before #%u", | |
498 | seq, ntohl(psp->hdr.seq)); | |
499 | skb_insert(p, skb, &call->rx_oos_queue); | |
500 | goto inserted; | |
501 | } | |
502 | } | |
503 | ||
504 | _debug("append oos #%u", seq); | |
505 | skb_queue_tail(&call->rx_oos_queue, skb); | |
506 | inserted: | |
507 | ||
508 | /* we might now have a new front to the queue */ | |
509 | if (call->rx_first_oos == 0 || seq < call->rx_first_oos) | |
510 | call->rx_first_oos = seq; | |
511 | ||
512 | read_lock(&call->state_lock); | |
513 | if (call->state < RXRPC_CALL_COMPLETE && | |
514 | call->rx_data_post == call->rx_first_oos) { | |
515 | _debug("drain rx oos now"); | |
516 | set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events); | |
517 | } | |
518 | read_unlock(&call->state_lock); | |
519 | ||
520 | spin_unlock_bh(&call->lock); | |
521 | _leave(" [stored #%u]", call->rx_first_oos); | |
522 | } | |
523 | ||
524 | /* | |
525 | * clear the Tx window on final ACK reception | |
526 | */ | |
527 | static void rxrpc_zap_tx_window(struct rxrpc_call *call) | |
528 | { | |
529 | struct rxrpc_skb_priv *sp; | |
530 | struct sk_buff *skb; | |
531 | unsigned long _skb, *acks_window; | |
4e36a95e | 532 | u8 winsz = call->acks_winsz; |
17926a79 DH |
533 | int tail; |
534 | ||
535 | acks_window = call->acks_window; | |
536 | call->acks_window = NULL; | |
537 | ||
538 | while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) { | |
539 | tail = call->acks_tail; | |
540 | smp_read_barrier_depends(); | |
541 | _skb = acks_window[tail] & ~1; | |
542 | smp_mb(); | |
543 | call->acks_tail = (call->acks_tail + 1) & (winsz - 1); | |
544 | ||
545 | skb = (struct sk_buff *) _skb; | |
546 | sp = rxrpc_skb(skb); | |
547 | _debug("+++ clear Tx %u", ntohl(sp->hdr.seq)); | |
548 | rxrpc_free_skb(skb); | |
549 | } | |
550 | ||
551 | kfree(acks_window); | |
552 | } | |
553 | ||
224711df DH |
554 | /* |
555 | * process the extra information that may be appended to an ACK packet | |
556 | */ | |
557 | static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, | |
95c96174 | 558 | unsigned int latest, int nAcks) |
224711df DH |
559 | { |
560 | struct rxrpc_ackinfo ackinfo; | |
561 | struct rxrpc_peer *peer; | |
95c96174 | 562 | unsigned int mtu; |
224711df DH |
563 | |
564 | if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) { | |
565 | _leave(" [no ackinfo]"); | |
566 | return; | |
567 | } | |
568 | ||
569 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
570 | latest, | |
571 | ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU), | |
572 | ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max)); | |
573 | ||
574 | mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU)); | |
575 | ||
576 | peer = call->conn->trans->peer; | |
577 | if (mtu < peer->maxdata) { | |
578 | spin_lock_bh(&peer->lock); | |
579 | peer->maxdata = mtu; | |
580 | peer->mtu = mtu + peer->hdrsize; | |
581 | spin_unlock_bh(&peer->lock); | |
582 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
583 | } | |
584 | } | |
585 | ||
17926a79 DH |
586 | /* |
587 | * process packets in the reception queue | |
588 | */ | |
589 | static int rxrpc_process_rx_queue(struct rxrpc_call *call, | |
590 | u32 *_abort_code) | |
591 | { | |
592 | struct rxrpc_ackpacket ack; | |
593 | struct rxrpc_skb_priv *sp; | |
594 | struct sk_buff *skb; | |
595 | bool post_ACK; | |
596 | int latest; | |
597 | u32 hard, tx; | |
598 | ||
599 | _enter(""); | |
600 | ||
601 | process_further: | |
602 | skb = skb_dequeue(&call->rx_queue); | |
603 | if (!skb) | |
604 | return -EAGAIN; | |
605 | ||
606 | _net("deferred skb %p", skb); | |
607 | ||
608 | sp = rxrpc_skb(skb); | |
609 | ||
610 | _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state); | |
611 | ||
612 | post_ACK = false; | |
613 | ||
614 | switch (sp->hdr.type) { | |
615 | /* data packets that wind up here have been received out of | |
616 | * order, need security processing or are jumbo packets */ | |
617 | case RXRPC_PACKET_TYPE_DATA: | |
618 | _proto("OOSQ DATA %%%u { #%u }", | |
619 | ntohl(sp->hdr.serial), ntohl(sp->hdr.seq)); | |
620 | ||
621 | /* secured packets must be verified and possibly decrypted */ | |
622 | if (rxrpc_verify_packet(call, skb, _abort_code) < 0) | |
623 | goto protocol_error; | |
624 | ||
625 | rxrpc_insert_oos_packet(call, skb); | |
626 | goto process_further; | |
627 | ||
628 | /* partial ACK to process */ | |
629 | case RXRPC_PACKET_TYPE_ACK: | |
630 | if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) { | |
631 | _debug("extraction failure"); | |
632 | goto protocol_error; | |
633 | } | |
634 | if (!skb_pull(skb, sizeof(ack))) | |
635 | BUG(); | |
636 | ||
637 | latest = ntohl(sp->hdr.serial); | |
638 | hard = ntohl(ack.firstPacket); | |
639 | tx = atomic_read(&call->sequence); | |
640 | ||
641 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
642 | latest, | |
643 | ntohs(ack.maxSkew), | |
644 | hard, | |
645 | ntohl(ack.previousPacket), | |
646 | ntohl(ack.serial), | |
08d4d217 | 647 | rxrpc_acks(ack.reason), |
17926a79 DH |
648 | ack.nAcks); |
649 | ||
224711df DH |
650 | rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks); |
651 | ||
17926a79 DH |
652 | if (ack.reason == RXRPC_ACK_PING) { |
653 | _proto("Rx ACK %%%u PING Request", latest); | |
654 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
655 | sp->hdr.serial, true); | |
656 | } | |
657 | ||
658 | /* discard any out-of-order or duplicate ACKs */ | |
659 | if (latest - call->acks_latest <= 0) { | |
660 | _debug("discard ACK %d <= %d", | |
661 | latest, call->acks_latest); | |
662 | goto discard; | |
663 | } | |
664 | call->acks_latest = latest; | |
665 | ||
666 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
667 | call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
668 | call->state != RXRPC_CALL_SERVER_SEND_REPLY && | |
669 | call->state != RXRPC_CALL_SERVER_AWAIT_ACK) | |
670 | goto discard; | |
671 | ||
672 | _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state); | |
673 | ||
674 | if (hard > 0) { | |
675 | if (hard - 1 > tx) { | |
676 | _debug("hard-ACK'd packet %d not transmitted" | |
677 | " (%d top)", | |
678 | hard - 1, tx); | |
679 | goto protocol_error; | |
680 | } | |
681 | ||
682 | if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY || | |
683 | call->state == RXRPC_CALL_SERVER_AWAIT_ACK) && | |
684 | hard > tx) | |
685 | goto all_acked; | |
686 | ||
687 | smp_rmb(); | |
688 | rxrpc_rotate_tx_window(call, hard - 1); | |
689 | } | |
690 | ||
691 | if (ack.nAcks > 0) { | |
692 | if (hard - 1 + ack.nAcks > tx) { | |
693 | _debug("soft-ACK'd packet %d+%d not" | |
694 | " transmitted (%d top)", | |
695 | hard - 1, ack.nAcks, tx); | |
696 | goto protocol_error; | |
697 | } | |
698 | ||
699 | if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0) | |
700 | goto protocol_error; | |
701 | } | |
702 | goto discard; | |
703 | ||
704 | /* complete ACK to process */ | |
705 | case RXRPC_PACKET_TYPE_ACKALL: | |
706 | goto all_acked; | |
707 | ||
708 | /* abort and busy are handled elsewhere */ | |
709 | case RXRPC_PACKET_TYPE_BUSY: | |
710 | case RXRPC_PACKET_TYPE_ABORT: | |
711 | BUG(); | |
712 | ||
713 | /* connection level events - also handled elsewhere */ | |
714 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
715 | case RXRPC_PACKET_TYPE_RESPONSE: | |
716 | case RXRPC_PACKET_TYPE_DEBUG: | |
717 | BUG(); | |
718 | } | |
719 | ||
720 | /* if we've had a hard ACK that covers all the packets we've sent, then | |
721 | * that ends that phase of the operation */ | |
722 | all_acked: | |
723 | write_lock_bh(&call->state_lock); | |
724 | _debug("ack all %d", call->state); | |
725 | ||
726 | switch (call->state) { | |
727 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
728 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
729 | break; | |
730 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
731 | _debug("srv complete"); | |
732 | call->state = RXRPC_CALL_COMPLETE; | |
733 | post_ACK = true; | |
734 | break; | |
735 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
736 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
737 | goto protocol_error_unlock; /* can't occur yet */ | |
738 | default: | |
739 | write_unlock_bh(&call->state_lock); | |
740 | goto discard; /* assume packet left over from earlier phase */ | |
741 | } | |
742 | ||
743 | write_unlock_bh(&call->state_lock); | |
744 | ||
745 | /* if all the packets we sent are hard-ACK'd, then we can discard | |
746 | * whatever we've got left */ | |
747 | _debug("clear Tx %d", | |
748 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
749 | ||
750 | del_timer_sync(&call->resend_timer); | |
751 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
752 | clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events); | |
753 | ||
754 | if (call->acks_window) | |
755 | rxrpc_zap_tx_window(call); | |
756 | ||
757 | if (post_ACK) { | |
758 | /* post the final ACK message for userspace to pick up */ | |
759 | _debug("post ACK"); | |
760 | skb->mark = RXRPC_SKB_MARK_FINAL_ACK; | |
761 | sp->call = call; | |
762 | rxrpc_get_call(call); | |
763 | spin_lock_bh(&call->lock); | |
764 | if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0) | |
765 | BUG(); | |
766 | spin_unlock_bh(&call->lock); | |
767 | goto process_further; | |
768 | } | |
769 | ||
770 | discard: | |
771 | rxrpc_free_skb(skb); | |
772 | goto process_further; | |
773 | ||
774 | protocol_error_unlock: | |
775 | write_unlock_bh(&call->state_lock); | |
776 | protocol_error: | |
777 | rxrpc_free_skb(skb); | |
778 | _leave(" = -EPROTO"); | |
779 | return -EPROTO; | |
780 | } | |
781 | ||
782 | /* | |
783 | * post a message to the socket Rx queue for recvmsg() to pick up | |
784 | */ | |
785 | static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, | |
786 | bool fatal) | |
787 | { | |
788 | struct rxrpc_skb_priv *sp; | |
789 | struct sk_buff *skb; | |
790 | int ret; | |
791 | ||
792 | _enter("{%d,%lx},%u,%u,%d", | |
793 | call->debug_id, call->flags, mark, error, fatal); | |
794 | ||
795 | /* remove timers and things for fatal messages */ | |
796 | if (fatal) { | |
797 | del_timer_sync(&call->resend_timer); | |
798 | del_timer_sync(&call->ack_timer); | |
799 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
800 | } | |
801 | ||
802 | if (mark != RXRPC_SKB_MARK_NEW_CALL && | |
803 | !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
804 | _leave("[no userid]"); | |
805 | return 0; | |
806 | } | |
807 | ||
808 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
809 | skb = alloc_skb(0, GFP_NOFS); | |
810 | if (!skb) | |
811 | return -ENOMEM; | |
812 | ||
813 | rxrpc_new_skb(skb); | |
814 | ||
815 | skb->mark = mark; | |
816 | ||
817 | sp = rxrpc_skb(skb); | |
818 | memset(sp, 0, sizeof(*sp)); | |
819 | sp->error = error; | |
820 | sp->call = call; | |
821 | rxrpc_get_call(call); | |
822 | ||
823 | spin_lock_bh(&call->lock); | |
824 | ret = rxrpc_queue_rcv_skb(call, skb, true, fatal); | |
825 | spin_unlock_bh(&call->lock); | |
163e3cb7 | 826 | BUG_ON(ret < 0); |
17926a79 DH |
827 | } |
828 | ||
829 | return 0; | |
830 | } | |
831 | ||
832 | /* | |
833 | * handle background processing of incoming call packets and ACK / abort | |
834 | * generation | |
835 | */ | |
836 | void rxrpc_process_call(struct work_struct *work) | |
837 | { | |
838 | struct rxrpc_call *call = | |
839 | container_of(work, struct rxrpc_call, processor); | |
840 | struct rxrpc_ackpacket ack; | |
841 | struct rxrpc_ackinfo ackinfo; | |
842 | struct rxrpc_header hdr; | |
843 | struct msghdr msg; | |
844 | struct kvec iov[5]; | |
845 | unsigned long bits; | |
224711df | 846 | __be32 data, pad; |
17926a79 | 847 | size_t len; |
224711df | 848 | int genbit, loop, nbit, ioc, ret, mtu; |
17926a79 DH |
849 | u32 abort_code = RX_PROTOCOL_ERROR; |
850 | u8 *acks = NULL; | |
851 | ||
852 | //printk("\n--------------------\n"); | |
853 | _enter("{%d,%s,%lx} [%lu]", | |
854 | call->debug_id, rxrpc_call_states[call->state], call->events, | |
855 | (jiffies - call->creation_jif) / (HZ / 10)); | |
856 | ||
857 | if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) { | |
858 | _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX"); | |
859 | return; | |
860 | } | |
861 | ||
862 | /* there's a good chance we're going to have to send a message, so set | |
863 | * one up in advance */ | |
864 | msg.msg_name = &call->conn->trans->peer->srx.transport.sin; | |
865 | msg.msg_namelen = sizeof(call->conn->trans->peer->srx.transport.sin); | |
866 | msg.msg_control = NULL; | |
867 | msg.msg_controllen = 0; | |
868 | msg.msg_flags = 0; | |
869 | ||
870 | hdr.epoch = call->conn->epoch; | |
871 | hdr.cid = call->cid; | |
872 | hdr.callNumber = call->call_id; | |
873 | hdr.seq = 0; | |
874 | hdr.type = RXRPC_PACKET_TYPE_ACK; | |
875 | hdr.flags = call->conn->out_clientflag; | |
876 | hdr.userStatus = 0; | |
877 | hdr.securityIndex = call->conn->security_ix; | |
878 | hdr._rsvd = 0; | |
879 | hdr.serviceId = call->conn->service_id; | |
880 | ||
881 | memset(iov, 0, sizeof(iov)); | |
882 | iov[0].iov_base = &hdr; | |
883 | iov[0].iov_len = sizeof(hdr); | |
884 | ||
885 | /* deal with events of a final nature */ | |
886 | if (test_bit(RXRPC_CALL_RELEASE, &call->events)) { | |
887 | rxrpc_release_call(call); | |
888 | clear_bit(RXRPC_CALL_RELEASE, &call->events); | |
889 | } | |
890 | ||
891 | if (test_bit(RXRPC_CALL_RCVD_ERROR, &call->events)) { | |
892 | int error; | |
893 | ||
894 | clear_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
895 | clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events); | |
896 | clear_bit(RXRPC_CALL_ABORT, &call->events); | |
897 | ||
898 | error = call->conn->trans->peer->net_error; | |
899 | _debug("post net error %d", error); | |
900 | ||
901 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR, | |
902 | error, true) < 0) | |
903 | goto no_mem; | |
904 | clear_bit(RXRPC_CALL_RCVD_ERROR, &call->events); | |
905 | goto kill_ACKs; | |
906 | } | |
907 | ||
908 | if (test_bit(RXRPC_CALL_CONN_ABORT, &call->events)) { | |
909 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); | |
910 | ||
911 | clear_bit(RXRPC_CALL_REJECT_BUSY, &call->events); | |
912 | clear_bit(RXRPC_CALL_ABORT, &call->events); | |
913 | ||
914 | _debug("post conn abort"); | |
915 | ||
916 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
917 | call->conn->error, true) < 0) | |
918 | goto no_mem; | |
919 | clear_bit(RXRPC_CALL_CONN_ABORT, &call->events); | |
920 | goto kill_ACKs; | |
921 | } | |
922 | ||
923 | if (test_bit(RXRPC_CALL_REJECT_BUSY, &call->events)) { | |
924 | hdr.type = RXRPC_PACKET_TYPE_BUSY; | |
925 | genbit = RXRPC_CALL_REJECT_BUSY; | |
926 | goto send_message; | |
927 | } | |
928 | ||
929 | if (test_bit(RXRPC_CALL_ABORT, &call->events)) { | |
930 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); | |
931 | ||
932 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
933 | ECONNABORTED, true) < 0) | |
934 | goto no_mem; | |
935 | hdr.type = RXRPC_PACKET_TYPE_ABORT; | |
936 | data = htonl(call->abort_code); | |
937 | iov[1].iov_base = &data; | |
938 | iov[1].iov_len = sizeof(data); | |
939 | genbit = RXRPC_CALL_ABORT; | |
940 | goto send_message; | |
941 | } | |
942 | ||
943 | if (test_bit(RXRPC_CALL_ACK_FINAL, &call->events)) { | |
17926a79 | 944 | genbit = RXRPC_CALL_ACK_FINAL; |
224711df DH |
945 | |
946 | ack.bufferSpace = htons(8); | |
947 | ack.maxSkew = 0; | |
948 | ack.serial = 0; | |
949 | ack.reason = RXRPC_ACK_IDLE; | |
950 | ack.nAcks = 0; | |
951 | call->ackr_reason = 0; | |
952 | ||
953 | spin_lock_bh(&call->lock); | |
954 | ack.serial = call->ackr_serial; | |
955 | ack.previousPacket = call->ackr_prev_seq; | |
956 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
957 | spin_unlock_bh(&call->lock); | |
958 | ||
959 | pad = 0; | |
960 | ||
961 | iov[1].iov_base = &ack; | |
962 | iov[1].iov_len = sizeof(ack); | |
963 | iov[2].iov_base = &pad; | |
964 | iov[2].iov_len = 3; | |
965 | iov[3].iov_base = &ackinfo; | |
966 | iov[3].iov_len = sizeof(ackinfo); | |
967 | goto send_ACK; | |
17926a79 DH |
968 | } |
969 | ||
970 | if (call->events & ((1 << RXRPC_CALL_RCVD_BUSY) | | |
971 | (1 << RXRPC_CALL_RCVD_ABORT)) | |
972 | ) { | |
973 | u32 mark; | |
974 | ||
975 | if (test_bit(RXRPC_CALL_RCVD_ABORT, &call->events)) | |
976 | mark = RXRPC_SKB_MARK_REMOTE_ABORT; | |
977 | else | |
978 | mark = RXRPC_SKB_MARK_BUSY; | |
979 | ||
980 | _debug("post abort/busy"); | |
981 | rxrpc_clear_tx_window(call); | |
982 | if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0) | |
983 | goto no_mem; | |
984 | ||
985 | clear_bit(RXRPC_CALL_RCVD_BUSY, &call->events); | |
986 | clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
987 | goto kill_ACKs; | |
988 | } | |
989 | ||
990 | if (test_and_clear_bit(RXRPC_CALL_RCVD_ACKALL, &call->events)) { | |
991 | _debug("do implicit ackall"); | |
992 | rxrpc_clear_tx_window(call); | |
993 | } | |
994 | ||
995 | if (test_bit(RXRPC_CALL_LIFE_TIMER, &call->events)) { | |
996 | write_lock_bh(&call->state_lock); | |
997 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
998 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
999 | call->abort_code = RX_CALL_TIMEOUT; | |
1000 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
1001 | } | |
1002 | write_unlock_bh(&call->state_lock); | |
1003 | ||
1004 | _debug("post timeout"); | |
1005 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
1006 | ETIME, true) < 0) | |
1007 | goto no_mem; | |
1008 | ||
1009 | clear_bit(RXRPC_CALL_LIFE_TIMER, &call->events); | |
1010 | goto kill_ACKs; | |
1011 | } | |
1012 | ||
1013 | /* deal with assorted inbound messages */ | |
1014 | if (!skb_queue_empty(&call->rx_queue)) { | |
1015 | switch (rxrpc_process_rx_queue(call, &abort_code)) { | |
1016 | case 0: | |
1017 | case -EAGAIN: | |
1018 | break; | |
1019 | case -ENOMEM: | |
1020 | goto no_mem; | |
1021 | case -EKEYEXPIRED: | |
1022 | case -EKEYREJECTED: | |
1023 | case -EPROTO: | |
1024 | rxrpc_abort_call(call, abort_code); | |
1025 | goto kill_ACKs; | |
1026 | } | |
1027 | } | |
1028 | ||
1029 | /* handle resending */ | |
1030 | if (test_and_clear_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
1031 | rxrpc_resend_timer(call); | |
1032 | if (test_and_clear_bit(RXRPC_CALL_RESEND, &call->events)) | |
1033 | rxrpc_resend(call); | |
1034 | ||
1035 | /* consider sending an ordinary ACK */ | |
1036 | if (test_bit(RXRPC_CALL_ACK, &call->events)) { | |
17926a79 DH |
1037 | _debug("send ACK: window: %d - %d { %lx }", |
1038 | call->rx_data_eaten, call->ackr_win_top, | |
1039 | call->ackr_window[0]); | |
1040 | ||
1041 | if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST && | |
1042 | call->ackr_reason != RXRPC_ACK_PING_RESPONSE) { | |
1043 | /* ACK by sending reply DATA packet in this state */ | |
1044 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
1045 | goto maybe_reschedule; | |
1046 | } | |
1047 | ||
1048 | genbit = RXRPC_CALL_ACK; | |
1049 | ||
1050 | acks = kzalloc(call->ackr_win_top - call->rx_data_eaten, | |
1051 | GFP_NOFS); | |
1052 | if (!acks) | |
1053 | goto no_mem; | |
1054 | ||
1055 | //hdr.flags = RXRPC_SLOW_START_OK; | |
1056 | ack.bufferSpace = htons(8); | |
1057 | ack.maxSkew = 0; | |
1058 | ack.serial = 0; | |
1059 | ack.reason = 0; | |
1060 | ||
17926a79 DH |
1061 | spin_lock_bh(&call->lock); |
1062 | ack.reason = call->ackr_reason; | |
1063 | ack.serial = call->ackr_serial; | |
1064 | ack.previousPacket = call->ackr_prev_seq; | |
1065 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
1066 | ||
1067 | ack.nAcks = 0; | |
1068 | for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { | |
1069 | nbit = loop * BITS_PER_LONG; | |
1070 | for (bits = call->ackr_window[loop]; bits; bits >>= 1 | |
1071 | ) { | |
1072 | _debug("- l=%d n=%d b=%lx", loop, nbit, bits); | |
1073 | if (bits & 1) { | |
1074 | acks[nbit] = RXRPC_ACK_TYPE_ACK; | |
1075 | ack.nAcks = nbit + 1; | |
1076 | } | |
1077 | nbit++; | |
1078 | } | |
1079 | } | |
1080 | call->ackr_reason = 0; | |
1081 | spin_unlock_bh(&call->lock); | |
1082 | ||
1083 | pad = 0; | |
1084 | ||
1085 | iov[1].iov_base = &ack; | |
1086 | iov[1].iov_len = sizeof(ack); | |
1087 | iov[2].iov_base = acks; | |
1088 | iov[2].iov_len = ack.nAcks; | |
1089 | iov[3].iov_base = &pad; | |
1090 | iov[3].iov_len = 3; | |
1091 | iov[4].iov_base = &ackinfo; | |
1092 | iov[4].iov_len = sizeof(ackinfo); | |
1093 | ||
1094 | switch (ack.reason) { | |
1095 | case RXRPC_ACK_REQUESTED: | |
1096 | case RXRPC_ACK_DUPLICATE: | |
1097 | case RXRPC_ACK_OUT_OF_SEQUENCE: | |
1098 | case RXRPC_ACK_EXCEEDS_WINDOW: | |
1099 | case RXRPC_ACK_NOSPACE: | |
1100 | case RXRPC_ACK_PING: | |
1101 | case RXRPC_ACK_PING_RESPONSE: | |
1102 | goto send_ACK_with_skew; | |
1103 | case RXRPC_ACK_DELAY: | |
1104 | case RXRPC_ACK_IDLE: | |
1105 | goto send_ACK; | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | /* handle completion of security negotiations on an incoming | |
1110 | * connection */ | |
1111 | if (test_and_clear_bit(RXRPC_CALL_SECURED, &call->events)) { | |
1112 | _debug("secured"); | |
1113 | spin_lock_bh(&call->lock); | |
1114 | ||
1115 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
1116 | _debug("securing"); | |
1117 | write_lock(&call->conn->lock); | |
1118 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
1119 | !test_bit(RXRPC_CALL_RELEASE, &call->events)) { | |
1120 | _debug("not released"); | |
1121 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
1122 | list_move_tail(&call->accept_link, | |
1123 | &call->socket->acceptq); | |
1124 | } | |
1125 | write_unlock(&call->conn->lock); | |
1126 | read_lock(&call->state_lock); | |
1127 | if (call->state < RXRPC_CALL_COMPLETE) | |
1128 | set_bit(RXRPC_CALL_POST_ACCEPT, &call->events); | |
1129 | read_unlock(&call->state_lock); | |
1130 | } | |
1131 | ||
1132 | spin_unlock_bh(&call->lock); | |
1133 | if (!test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) | |
1134 | goto maybe_reschedule; | |
1135 | } | |
1136 | ||
1137 | /* post a notification of an acceptable connection to the app */ | |
1138 | if (test_bit(RXRPC_CALL_POST_ACCEPT, &call->events)) { | |
1139 | _debug("post accept"); | |
1140 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL, | |
1141 | 0, false) < 0) | |
1142 | goto no_mem; | |
1143 | clear_bit(RXRPC_CALL_POST_ACCEPT, &call->events); | |
1144 | goto maybe_reschedule; | |
1145 | } | |
1146 | ||
1147 | /* handle incoming call acceptance */ | |
1148 | if (test_and_clear_bit(RXRPC_CALL_ACCEPTED, &call->events)) { | |
1149 | _debug("accepted"); | |
1150 | ASSERTCMP(call->rx_data_post, ==, 0); | |
1151 | call->rx_data_post = 1; | |
1152 | read_lock_bh(&call->state_lock); | |
1153 | if (call->state < RXRPC_CALL_COMPLETE) | |
1154 | set_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events); | |
1155 | read_unlock_bh(&call->state_lock); | |
1156 | } | |
1157 | ||
1158 | /* drain the out of sequence received packet queue into the packet Rx | |
1159 | * queue */ | |
1160 | if (test_and_clear_bit(RXRPC_CALL_DRAIN_RX_OOS, &call->events)) { | |
1161 | while (call->rx_data_post == call->rx_first_oos) | |
1162 | if (rxrpc_drain_rx_oos_queue(call) < 0) | |
1163 | break; | |
1164 | goto maybe_reschedule; | |
1165 | } | |
1166 | ||
1167 | /* other events may have been raised since we started checking */ | |
1168 | goto maybe_reschedule; | |
1169 | ||
1170 | send_ACK_with_skew: | |
1171 | ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) - | |
1172 | ntohl(ack.serial)); | |
1173 | send_ACK: | |
224711df DH |
1174 | mtu = call->conn->trans->peer->if_mtu; |
1175 | mtu -= call->conn->trans->peer->hdrsize; | |
1176 | ackinfo.maxMTU = htonl(mtu); | |
1177 | ackinfo.rwind = htonl(32); | |
1178 | ||
1179 | /* permit the peer to send us jumbo packets if it wants to */ | |
1180 | ackinfo.rxMTU = htonl(5692); | |
1181 | ackinfo.jumbo_max = htonl(4); | |
1182 | ||
17926a79 DH |
1183 | hdr.serial = htonl(atomic_inc_return(&call->conn->serial)); |
1184 | _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
1185 | ntohl(hdr.serial), | |
1186 | ntohs(ack.maxSkew), | |
1187 | ntohl(ack.firstPacket), | |
1188 | ntohl(ack.previousPacket), | |
1189 | ntohl(ack.serial), | |
08d4d217 | 1190 | rxrpc_acks(ack.reason), |
17926a79 DH |
1191 | ack.nAcks); |
1192 | ||
1193 | del_timer_sync(&call->ack_timer); | |
1194 | if (ack.nAcks > 0) | |
1195 | set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags); | |
1196 | goto send_message_2; | |
1197 | ||
1198 | send_message: | |
1199 | _debug("send message"); | |
1200 | ||
1201 | hdr.serial = htonl(atomic_inc_return(&call->conn->serial)); | |
1202 | _proto("Tx %s %%%u", rxrpc_pkts[hdr.type], ntohl(hdr.serial)); | |
1203 | send_message_2: | |
1204 | ||
1205 | len = iov[0].iov_len; | |
1206 | ioc = 1; | |
1207 | if (iov[4].iov_len) { | |
1208 | ioc = 5; | |
1209 | len += iov[4].iov_len; | |
1210 | len += iov[3].iov_len; | |
1211 | len += iov[2].iov_len; | |
1212 | len += iov[1].iov_len; | |
1213 | } else if (iov[3].iov_len) { | |
1214 | ioc = 4; | |
1215 | len += iov[3].iov_len; | |
1216 | len += iov[2].iov_len; | |
1217 | len += iov[1].iov_len; | |
1218 | } else if (iov[2].iov_len) { | |
1219 | ioc = 3; | |
1220 | len += iov[2].iov_len; | |
1221 | len += iov[1].iov_len; | |
1222 | } else if (iov[1].iov_len) { | |
1223 | ioc = 2; | |
1224 | len += iov[1].iov_len; | |
1225 | } | |
1226 | ||
1227 | ret = kernel_sendmsg(call->conn->trans->local->socket, | |
1228 | &msg, iov, ioc, len); | |
1229 | if (ret < 0) { | |
1230 | _debug("sendmsg failed: %d", ret); | |
1231 | read_lock_bh(&call->state_lock); | |
1232 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1233 | rxrpc_queue_call(call); |
17926a79 DH |
1234 | read_unlock_bh(&call->state_lock); |
1235 | goto error; | |
1236 | } | |
1237 | ||
1238 | switch (genbit) { | |
1239 | case RXRPC_CALL_ABORT: | |
1240 | clear_bit(genbit, &call->events); | |
1241 | clear_bit(RXRPC_CALL_RCVD_ABORT, &call->events); | |
1242 | goto kill_ACKs; | |
1243 | ||
1244 | case RXRPC_CALL_ACK_FINAL: | |
1245 | write_lock_bh(&call->state_lock); | |
1246 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) | |
1247 | call->state = RXRPC_CALL_COMPLETE; | |
1248 | write_unlock_bh(&call->state_lock); | |
1249 | goto kill_ACKs; | |
1250 | ||
1251 | default: | |
1252 | clear_bit(genbit, &call->events); | |
1253 | switch (call->state) { | |
1254 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
1255 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
1256 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
1257 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
1258 | _debug("start ACK timer"); | |
1259 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, | |
1260 | call->ackr_serial, false); | |
1261 | default: | |
1262 | break; | |
1263 | } | |
1264 | goto maybe_reschedule; | |
1265 | } | |
1266 | ||
1267 | kill_ACKs: | |
1268 | del_timer_sync(&call->ack_timer); | |
1269 | if (test_and_clear_bit(RXRPC_CALL_ACK_FINAL, &call->events)) | |
1270 | rxrpc_put_call(call); | |
1271 | clear_bit(RXRPC_CALL_ACK, &call->events); | |
1272 | ||
1273 | maybe_reschedule: | |
1274 | if (call->events || !skb_queue_empty(&call->rx_queue)) { | |
1275 | read_lock_bh(&call->state_lock); | |
1276 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1277 | rxrpc_queue_call(call); |
17926a79 DH |
1278 | read_unlock_bh(&call->state_lock); |
1279 | } | |
1280 | ||
1281 | /* don't leave aborted connections on the accept queue */ | |
1282 | if (call->state >= RXRPC_CALL_COMPLETE && | |
1283 | !list_empty(&call->accept_link)) { | |
1284 | _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }", | |
1285 | call, call->events, call->flags, | |
1286 | ntohl(call->conn->cid)); | |
1287 | ||
1288 | read_lock_bh(&call->state_lock); | |
1289 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
1290 | !test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) | |
651350d1 | 1291 | rxrpc_queue_call(call); |
17926a79 DH |
1292 | read_unlock_bh(&call->state_lock); |
1293 | } | |
1294 | ||
1295 | error: | |
1296 | clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags); | |
1297 | kfree(acks); | |
1298 | ||
1299 | /* because we don't want two CPUs both processing the work item for one | |
1300 | * call at the same time, we use a flag to note when it's busy; however | |
1301 | * this means there's a race between clearing the flag and setting the | |
1302 | * work pending bit and the work item being processed again */ | |
1303 | if (call->events && !work_pending(&call->processor)) { | |
1304 | _debug("jumpstart %x", ntohl(call->conn->cid)); | |
651350d1 | 1305 | rxrpc_queue_call(call); |
17926a79 DH |
1306 | } |
1307 | ||
1308 | _leave(""); | |
1309 | return; | |
1310 | ||
1311 | no_mem: | |
1312 | _debug("out of memory"); | |
1313 | goto maybe_reschedule; | |
1314 | } |