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 | ||
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 | ||
5873c083 DH |
22 | /* |
23 | * How long to wait before scheduling ACK generation after seeing a | |
24 | * packet with RXRPC_REQUEST_ACK set (in jiffies). | |
25 | */ | |
dad8aff7 | 26 | unsigned int rxrpc_requested_ack_delay = 1; |
5873c083 DH |
27 | |
28 | /* | |
29 | * How long to wait before scheduling an ACK with subtype DELAY (in jiffies). | |
30 | * | |
31 | * We use this when we've received new data packets. If those packets aren't | |
32 | * all consumed within this time we will send a DELAY ACK if an ACK was not | |
33 | * requested to let the sender know it doesn't need to resend. | |
34 | */ | |
dad8aff7 | 35 | unsigned int rxrpc_soft_ack_delay = 1 * HZ; |
5873c083 DH |
36 | |
37 | /* | |
38 | * How long to wait before scheduling an ACK with subtype IDLE (in jiffies). | |
39 | * | |
40 | * We use this when we've consumed some previously soft-ACK'd packets when | |
41 | * further packets aren't immediately received to decide when to send an IDLE | |
42 | * ACK let the other end know that it can free up its Tx buffer space. | |
43 | */ | |
dad8aff7 | 44 | unsigned int rxrpc_idle_ack_delay = 0.5 * HZ; |
17926a79 | 45 | |
817913d8 DH |
46 | /* |
47 | * Receive window size in packets. This indicates the maximum number of | |
48 | * unconsumed received packets we're willing to retain in memory. Once this | |
49 | * limit is hit, we should generate an EXCEEDS_WINDOW ACK and discard further | |
50 | * packets. | |
51 | */ | |
dad8aff7 | 52 | unsigned int rxrpc_rx_window_size = 32; |
817913d8 DH |
53 | |
54 | /* | |
55 | * Maximum Rx MTU size. This indicates to the sender the size of jumbo packet | |
56 | * made by gluing normal packets together that we're willing to handle. | |
57 | */ | |
dad8aff7 | 58 | unsigned int rxrpc_rx_mtu = 5692; |
817913d8 DH |
59 | |
60 | /* | |
61 | * The maximum number of fragments in a received jumbo packet that we tell the | |
62 | * sender that we're willing to handle. | |
63 | */ | |
dad8aff7 | 64 | unsigned int rxrpc_rx_jumbo_max = 4; |
817913d8 | 65 | |
08d4d217 DC |
66 | static const char *rxrpc_acks(u8 reason) |
67 | { | |
68 | static const char *const str[] = { | |
69 | "---", "REQ", "DUP", "OOS", "WIN", "MEM", "PNG", "PNR", "DLY", | |
70 | "IDL", "-?-" | |
71 | }; | |
72 | ||
73 | if (reason >= ARRAY_SIZE(str)) | |
74 | reason = ARRAY_SIZE(str) - 1; | |
75 | return str[reason]; | |
76 | } | |
17926a79 DH |
77 | |
78 | static const s8 rxrpc_ack_priority[] = { | |
79 | [0] = 0, | |
80 | [RXRPC_ACK_DELAY] = 1, | |
81 | [RXRPC_ACK_REQUESTED] = 2, | |
82 | [RXRPC_ACK_IDLE] = 3, | |
83 | [RXRPC_ACK_PING_RESPONSE] = 4, | |
84 | [RXRPC_ACK_DUPLICATE] = 5, | |
85 | [RXRPC_ACK_OUT_OF_SEQUENCE] = 6, | |
86 | [RXRPC_ACK_EXCEEDS_WINDOW] = 7, | |
87 | [RXRPC_ACK_NOSPACE] = 8, | |
88 | }; | |
89 | ||
90 | /* | |
91 | * propose an ACK be sent | |
92 | */ | |
4e36a95e | 93 | void __rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
0d12f8a4 | 94 | u32 serial, bool immediate) |
17926a79 DH |
95 | { |
96 | unsigned long expiry; | |
97 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
98 | ||
99 | ASSERTCMP(prior, >, 0); | |
100 | ||
101 | _enter("{%d},%s,%%%x,%u", | |
0d12f8a4 | 102 | call->debug_id, rxrpc_acks(ack_reason), serial, immediate); |
17926a79 DH |
103 | |
104 | if (prior < rxrpc_ack_priority[call->ackr_reason]) { | |
105 | if (immediate) | |
106 | goto cancel_timer; | |
107 | return; | |
108 | } | |
109 | ||
110 | /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial | |
111 | * numbers */ | |
112 | if (prior == rxrpc_ack_priority[call->ackr_reason]) { | |
113 | if (prior <= 4) | |
114 | call->ackr_serial = serial; | |
115 | if (immediate) | |
116 | goto cancel_timer; | |
117 | return; | |
118 | } | |
119 | ||
120 | call->ackr_reason = ack_reason; | |
121 | call->ackr_serial = serial; | |
122 | ||
123 | switch (ack_reason) { | |
124 | case RXRPC_ACK_DELAY: | |
125 | _debug("run delay timer"); | |
5873c083 DH |
126 | expiry = rxrpc_soft_ack_delay; |
127 | goto run_timer; | |
17926a79 DH |
128 | |
129 | case RXRPC_ACK_IDLE: | |
130 | if (!immediate) { | |
131 | _debug("run defer timer"); | |
5873c083 | 132 | expiry = rxrpc_idle_ack_delay; |
17926a79 DH |
133 | goto run_timer; |
134 | } | |
135 | goto cancel_timer; | |
136 | ||
137 | case RXRPC_ACK_REQUESTED: | |
5873c083 DH |
138 | expiry = rxrpc_requested_ack_delay; |
139 | if (!expiry) | |
17926a79 | 140 | goto cancel_timer; |
0d12f8a4 | 141 | if (!immediate || serial == 1) { |
17926a79 | 142 | _debug("run defer timer"); |
17926a79 DH |
143 | goto run_timer; |
144 | } | |
145 | ||
146 | default: | |
147 | _debug("immediate ACK"); | |
148 | goto cancel_timer; | |
149 | } | |
150 | ||
151 | run_timer: | |
152 | expiry += jiffies; | |
153 | if (!timer_pending(&call->ack_timer) || | |
154 | time_after(call->ack_timer.expires, expiry)) | |
155 | mod_timer(&call->ack_timer, expiry); | |
156 | return; | |
157 | ||
158 | cancel_timer: | |
0d12f8a4 | 159 | _debug("cancel timer %%%u", serial); |
17926a79 DH |
160 | try_to_del_timer_sync(&call->ack_timer); |
161 | read_lock_bh(&call->state_lock); | |
162 | if (call->state <= RXRPC_CALL_COMPLETE && | |
4c198ad1 | 163 | !test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events)) |
651350d1 | 164 | rxrpc_queue_call(call); |
17926a79 DH |
165 | read_unlock_bh(&call->state_lock); |
166 | } | |
167 | ||
168 | /* | |
169 | * propose an ACK be sent, locking the call structure | |
170 | */ | |
4e36a95e | 171 | void rxrpc_propose_ACK(struct rxrpc_call *call, u8 ack_reason, |
0d12f8a4 | 172 | u32 serial, bool immediate) |
17926a79 DH |
173 | { |
174 | s8 prior = rxrpc_ack_priority[ack_reason]; | |
175 | ||
176 | if (prior > rxrpc_ack_priority[call->ackr_reason]) { | |
177 | spin_lock_bh(&call->lock); | |
178 | __rxrpc_propose_ACK(call, ack_reason, serial, immediate); | |
179 | spin_unlock_bh(&call->lock); | |
180 | } | |
181 | } | |
182 | ||
183 | /* | |
184 | * set the resend timer | |
185 | */ | |
186 | static void rxrpc_set_resend(struct rxrpc_call *call, u8 resend, | |
187 | unsigned long resend_at) | |
188 | { | |
189 | read_lock_bh(&call->state_lock); | |
190 | if (call->state >= RXRPC_CALL_COMPLETE) | |
191 | resend = 0; | |
192 | ||
193 | if (resend & 1) { | |
194 | _debug("SET RESEND"); | |
4c198ad1 | 195 | set_bit(RXRPC_CALL_EV_RESEND, &call->events); |
17926a79 DH |
196 | } |
197 | ||
198 | if (resend & 2) { | |
199 | _debug("MODIFY RESEND TIMER"); | |
200 | set_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
201 | mod_timer(&call->resend_timer, resend_at); | |
202 | } else { | |
203 | _debug("KILL RESEND TIMER"); | |
204 | del_timer_sync(&call->resend_timer); | |
4c198ad1 | 205 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
17926a79 DH |
206 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
207 | } | |
208 | read_unlock_bh(&call->state_lock); | |
209 | } | |
210 | ||
211 | /* | |
212 | * resend packets | |
213 | */ | |
214 | static void rxrpc_resend(struct rxrpc_call *call) | |
215 | { | |
0d12f8a4 | 216 | struct rxrpc_wire_header *whdr; |
17926a79 | 217 | struct rxrpc_skb_priv *sp; |
17926a79 DH |
218 | struct sk_buff *txb; |
219 | unsigned long *p_txb, resend_at; | |
c03ae533 FW |
220 | bool stop; |
221 | int loop; | |
17926a79 DH |
222 | u8 resend; |
223 | ||
224 | _enter("{%d,%d,%d,%d},", | |
225 | call->acks_hard, call->acks_unacked, | |
226 | atomic_read(&call->sequence), | |
227 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
228 | ||
c03ae533 | 229 | stop = false; |
17926a79 DH |
230 | resend = 0; |
231 | resend_at = 0; | |
232 | ||
233 | for (loop = call->acks_tail; | |
234 | loop != call->acks_head || stop; | |
235 | loop = (loop + 1) & (call->acks_winsz - 1) | |
236 | ) { | |
237 | p_txb = call->acks_window + loop; | |
238 | smp_read_barrier_depends(); | |
239 | if (*p_txb & 1) | |
240 | continue; | |
241 | ||
242 | txb = (struct sk_buff *) *p_txb; | |
243 | sp = rxrpc_skb(txb); | |
244 | ||
245 | if (sp->need_resend) { | |
3db1cd5c | 246 | sp->need_resend = false; |
17926a79 DH |
247 | |
248 | /* each Tx packet has a new serial number */ | |
0d12f8a4 | 249 | sp->hdr.serial = atomic_inc_return(&call->conn->serial); |
17926a79 | 250 | |
0d12f8a4 DH |
251 | whdr = (struct rxrpc_wire_header *)txb->head; |
252 | whdr->serial = htonl(sp->hdr.serial); | |
17926a79 DH |
253 | |
254 | _proto("Tx DATA %%%u { #%d }", | |
0d12f8a4 | 255 | sp->hdr.serial, sp->hdr.seq); |
17926a79 | 256 | if (rxrpc_send_packet(call->conn->trans, txb) < 0) { |
c03ae533 | 257 | stop = true; |
17926a79 DH |
258 | sp->resend_at = jiffies + 3; |
259 | } else { | |
260 | sp->resend_at = | |
765dd3bb | 261 | jiffies + rxrpc_resend_timeout; |
17926a79 DH |
262 | } |
263 | } | |
264 | ||
265 | if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 266 | sp->need_resend = true; |
17926a79 DH |
267 | resend |= 1; |
268 | } else if (resend & 2) { | |
269 | if (time_before(sp->resend_at, resend_at)) | |
270 | resend_at = sp->resend_at; | |
271 | } else { | |
272 | resend_at = sp->resend_at; | |
273 | resend |= 2; | |
274 | } | |
275 | } | |
276 | ||
277 | rxrpc_set_resend(call, resend, resend_at); | |
278 | _leave(""); | |
279 | } | |
280 | ||
281 | /* | |
282 | * handle resend timer expiry | |
283 | */ | |
284 | static void rxrpc_resend_timer(struct rxrpc_call *call) | |
285 | { | |
286 | struct rxrpc_skb_priv *sp; | |
287 | struct sk_buff *txb; | |
288 | unsigned long *p_txb, resend_at; | |
289 | int loop; | |
290 | u8 resend; | |
291 | ||
292 | _enter("%d,%d,%d", | |
293 | call->acks_tail, call->acks_unacked, call->acks_head); | |
294 | ||
3b5bac2b DH |
295 | if (call->state >= RXRPC_CALL_COMPLETE) |
296 | return; | |
297 | ||
17926a79 DH |
298 | resend = 0; |
299 | resend_at = 0; | |
300 | ||
301 | for (loop = call->acks_unacked; | |
302 | loop != call->acks_head; | |
303 | loop = (loop + 1) & (call->acks_winsz - 1) | |
304 | ) { | |
305 | p_txb = call->acks_window + loop; | |
306 | smp_read_barrier_depends(); | |
307 | txb = (struct sk_buff *) (*p_txb & ~1); | |
308 | sp = rxrpc_skb(txb); | |
309 | ||
310 | ASSERT(!(*p_txb & 1)); | |
311 | ||
312 | if (sp->need_resend) { | |
313 | ; | |
314 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 315 | sp->need_resend = true; |
17926a79 DH |
316 | resend |= 1; |
317 | } else if (resend & 2) { | |
318 | if (time_before(sp->resend_at, resend_at)) | |
319 | resend_at = sp->resend_at; | |
320 | } else { | |
321 | resend_at = sp->resend_at; | |
322 | resend |= 2; | |
323 | } | |
324 | } | |
325 | ||
326 | rxrpc_set_resend(call, resend, resend_at); | |
327 | _leave(""); | |
328 | } | |
329 | ||
330 | /* | |
331 | * process soft ACKs of our transmitted packets | |
332 | * - these indicate packets the peer has or has not received, but hasn't yet | |
333 | * given to the consumer, and so can still be discarded and re-requested | |
334 | */ | |
335 | static int rxrpc_process_soft_ACKs(struct rxrpc_call *call, | |
336 | struct rxrpc_ackpacket *ack, | |
337 | struct sk_buff *skb) | |
338 | { | |
339 | struct rxrpc_skb_priv *sp; | |
340 | struct sk_buff *txb; | |
341 | unsigned long *p_txb, resend_at; | |
342 | int loop; | |
343 | u8 sacks[RXRPC_MAXACKS], resend; | |
344 | ||
345 | _enter("{%d,%d},{%d},", | |
346 | call->acks_hard, | |
347 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz), | |
348 | ack->nAcks); | |
349 | ||
350 | if (skb_copy_bits(skb, 0, sacks, ack->nAcks) < 0) | |
351 | goto protocol_error; | |
352 | ||
353 | resend = 0; | |
354 | resend_at = 0; | |
355 | for (loop = 0; loop < ack->nAcks; loop++) { | |
356 | p_txb = call->acks_window; | |
357 | p_txb += (call->acks_tail + loop) & (call->acks_winsz - 1); | |
358 | smp_read_barrier_depends(); | |
359 | txb = (struct sk_buff *) (*p_txb & ~1); | |
360 | sp = rxrpc_skb(txb); | |
361 | ||
362 | switch (sacks[loop]) { | |
363 | case RXRPC_ACK_TYPE_ACK: | |
3db1cd5c | 364 | sp->need_resend = false; |
17926a79 DH |
365 | *p_txb |= 1; |
366 | break; | |
367 | case RXRPC_ACK_TYPE_NACK: | |
3db1cd5c | 368 | sp->need_resend = true; |
17926a79 DH |
369 | *p_txb &= ~1; |
370 | resend = 1; | |
371 | break; | |
372 | default: | |
373 | _debug("Unsupported ACK type %d", sacks[loop]); | |
374 | goto protocol_error; | |
375 | } | |
376 | } | |
377 | ||
378 | smp_mb(); | |
379 | call->acks_unacked = (call->acks_tail + loop) & (call->acks_winsz - 1); | |
380 | ||
381 | /* anything not explicitly ACK'd is implicitly NACK'd, but may just not | |
382 | * have been received or processed yet by the far end */ | |
383 | for (loop = call->acks_unacked; | |
384 | loop != call->acks_head; | |
385 | loop = (loop + 1) & (call->acks_winsz - 1) | |
386 | ) { | |
387 | p_txb = call->acks_window + loop; | |
388 | smp_read_barrier_depends(); | |
389 | txb = (struct sk_buff *) (*p_txb & ~1); | |
390 | sp = rxrpc_skb(txb); | |
391 | ||
392 | if (*p_txb & 1) { | |
393 | /* packet must have been discarded */ | |
3db1cd5c | 394 | sp->need_resend = true; |
17926a79 DH |
395 | *p_txb &= ~1; |
396 | resend |= 1; | |
397 | } else if (sp->need_resend) { | |
398 | ; | |
399 | } else if (time_after_eq(jiffies + 1, sp->resend_at)) { | |
3db1cd5c | 400 | sp->need_resend = true; |
17926a79 DH |
401 | resend |= 1; |
402 | } else if (resend & 2) { | |
403 | if (time_before(sp->resend_at, resend_at)) | |
404 | resend_at = sp->resend_at; | |
405 | } else { | |
406 | resend_at = sp->resend_at; | |
407 | resend |= 2; | |
408 | } | |
409 | } | |
410 | ||
411 | rxrpc_set_resend(call, resend, resend_at); | |
412 | _leave(" = 0"); | |
413 | return 0; | |
414 | ||
415 | protocol_error: | |
416 | _leave(" = -EPROTO"); | |
417 | return -EPROTO; | |
418 | } | |
419 | ||
420 | /* | |
421 | * discard hard-ACK'd packets from the Tx window | |
422 | */ | |
423 | static void rxrpc_rotate_tx_window(struct rxrpc_call *call, u32 hard) | |
424 | { | |
17926a79 DH |
425 | unsigned long _skb; |
426 | int tail = call->acks_tail, old_tail; | |
427 | int win = CIRC_CNT(call->acks_head, tail, call->acks_winsz); | |
428 | ||
0d12f8a4 | 429 | kenter("{%u,%u},%u", call->acks_hard, win, hard); |
17926a79 DH |
430 | |
431 | ASSERTCMP(hard - call->acks_hard, <=, win); | |
432 | ||
433 | while (call->acks_hard < hard) { | |
434 | smp_read_barrier_depends(); | |
435 | _skb = call->acks_window[tail] & ~1; | |
17926a79 DH |
436 | rxrpc_free_skb((struct sk_buff *) _skb); |
437 | old_tail = tail; | |
438 | tail = (tail + 1) & (call->acks_winsz - 1); | |
439 | call->acks_tail = tail; | |
440 | if (call->acks_unacked == old_tail) | |
441 | call->acks_unacked = tail; | |
442 | call->acks_hard++; | |
443 | } | |
444 | ||
445 | wake_up(&call->tx_waitq); | |
446 | } | |
447 | ||
448 | /* | |
449 | * clear the Tx window in the event of a failure | |
450 | */ | |
451 | static void rxrpc_clear_tx_window(struct rxrpc_call *call) | |
452 | { | |
453 | rxrpc_rotate_tx_window(call, atomic_read(&call->sequence)); | |
454 | } | |
455 | ||
456 | /* | |
457 | * drain the out of sequence received packet queue into the packet Rx queue | |
458 | */ | |
459 | static int rxrpc_drain_rx_oos_queue(struct rxrpc_call *call) | |
460 | { | |
461 | struct rxrpc_skb_priv *sp; | |
462 | struct sk_buff *skb; | |
463 | bool terminal; | |
464 | int ret; | |
465 | ||
466 | _enter("{%d,%d}", call->rx_data_post, call->rx_first_oos); | |
467 | ||
468 | spin_lock_bh(&call->lock); | |
469 | ||
470 | ret = -ECONNRESET; | |
471 | if (test_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
472 | goto socket_unavailable; | |
473 | ||
474 | skb = skb_dequeue(&call->rx_oos_queue); | |
475 | if (skb) { | |
476 | sp = rxrpc_skb(skb); | |
477 | ||
478 | _debug("drain OOS packet %d [%d]", | |
0d12f8a4 | 479 | sp->hdr.seq, call->rx_first_oos); |
17926a79 | 480 | |
0d12f8a4 | 481 | if (sp->hdr.seq != call->rx_first_oos) { |
17926a79 | 482 | skb_queue_head(&call->rx_oos_queue, skb); |
0d12f8a4 | 483 | call->rx_first_oos = rxrpc_skb(skb)->hdr.seq; |
17926a79 DH |
484 | _debug("requeue %p {%u}", skb, call->rx_first_oos); |
485 | } else { | |
486 | skb->mark = RXRPC_SKB_MARK_DATA; | |
487 | terminal = ((sp->hdr.flags & RXRPC_LAST_PACKET) && | |
488 | !(sp->hdr.flags & RXRPC_CLIENT_INITIATED)); | |
489 | ret = rxrpc_queue_rcv_skb(call, skb, true, terminal); | |
490 | BUG_ON(ret < 0); | |
491 | _debug("drain #%u", call->rx_data_post); | |
492 | call->rx_data_post++; | |
493 | ||
494 | /* find out what the next packet is */ | |
495 | skb = skb_peek(&call->rx_oos_queue); | |
496 | if (skb) | |
0d12f8a4 | 497 | call->rx_first_oos = rxrpc_skb(skb)->hdr.seq; |
17926a79 DH |
498 | else |
499 | call->rx_first_oos = 0; | |
500 | _debug("peek %p {%u}", skb, call->rx_first_oos); | |
501 | } | |
502 | } | |
503 | ||
504 | ret = 0; | |
505 | socket_unavailable: | |
506 | spin_unlock_bh(&call->lock); | |
507 | _leave(" = %d", ret); | |
508 | return ret; | |
509 | } | |
510 | ||
511 | /* | |
512 | * insert an out of sequence packet into the buffer | |
513 | */ | |
514 | static void rxrpc_insert_oos_packet(struct rxrpc_call *call, | |
515 | struct sk_buff *skb) | |
516 | { | |
517 | struct rxrpc_skb_priv *sp, *psp; | |
518 | struct sk_buff *p; | |
519 | u32 seq; | |
520 | ||
521 | sp = rxrpc_skb(skb); | |
0d12f8a4 | 522 | seq = sp->hdr.seq; |
17926a79 DH |
523 | _enter(",,{%u}", seq); |
524 | ||
525 | skb->destructor = rxrpc_packet_destructor; | |
526 | ASSERTCMP(sp->call, ==, NULL); | |
527 | sp->call = call; | |
528 | rxrpc_get_call(call); | |
529 | ||
530 | /* insert into the buffer in sequence order */ | |
531 | spin_lock_bh(&call->lock); | |
532 | ||
533 | skb_queue_walk(&call->rx_oos_queue, p) { | |
534 | psp = rxrpc_skb(p); | |
0d12f8a4 DH |
535 | if (psp->hdr.seq > seq) { |
536 | _debug("insert oos #%u before #%u", seq, psp->hdr.seq); | |
17926a79 DH |
537 | skb_insert(p, skb, &call->rx_oos_queue); |
538 | goto inserted; | |
539 | } | |
540 | } | |
541 | ||
542 | _debug("append oos #%u", seq); | |
543 | skb_queue_tail(&call->rx_oos_queue, skb); | |
544 | inserted: | |
545 | ||
546 | /* we might now have a new front to the queue */ | |
547 | if (call->rx_first_oos == 0 || seq < call->rx_first_oos) | |
548 | call->rx_first_oos = seq; | |
549 | ||
550 | read_lock(&call->state_lock); | |
551 | if (call->state < RXRPC_CALL_COMPLETE && | |
552 | call->rx_data_post == call->rx_first_oos) { | |
553 | _debug("drain rx oos now"); | |
4c198ad1 | 554 | set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events); |
17926a79 DH |
555 | } |
556 | read_unlock(&call->state_lock); | |
557 | ||
558 | spin_unlock_bh(&call->lock); | |
559 | _leave(" [stored #%u]", call->rx_first_oos); | |
560 | } | |
561 | ||
562 | /* | |
563 | * clear the Tx window on final ACK reception | |
564 | */ | |
565 | static void rxrpc_zap_tx_window(struct rxrpc_call *call) | |
566 | { | |
567 | struct rxrpc_skb_priv *sp; | |
568 | struct sk_buff *skb; | |
569 | unsigned long _skb, *acks_window; | |
4e36a95e | 570 | u8 winsz = call->acks_winsz; |
17926a79 DH |
571 | int tail; |
572 | ||
573 | acks_window = call->acks_window; | |
574 | call->acks_window = NULL; | |
575 | ||
576 | while (CIRC_CNT(call->acks_head, call->acks_tail, winsz) > 0) { | |
577 | tail = call->acks_tail; | |
578 | smp_read_barrier_depends(); | |
579 | _skb = acks_window[tail] & ~1; | |
580 | smp_mb(); | |
581 | call->acks_tail = (call->acks_tail + 1) & (winsz - 1); | |
582 | ||
583 | skb = (struct sk_buff *) _skb; | |
584 | sp = rxrpc_skb(skb); | |
0d12f8a4 | 585 | _debug("+++ clear Tx %u", sp->hdr.seq); |
17926a79 DH |
586 | rxrpc_free_skb(skb); |
587 | } | |
588 | ||
589 | kfree(acks_window); | |
590 | } | |
591 | ||
224711df DH |
592 | /* |
593 | * process the extra information that may be appended to an ACK packet | |
594 | */ | |
595 | static void rxrpc_extract_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, | |
95c96174 | 596 | unsigned int latest, int nAcks) |
224711df DH |
597 | { |
598 | struct rxrpc_ackinfo ackinfo; | |
599 | struct rxrpc_peer *peer; | |
95c96174 | 600 | unsigned int mtu; |
224711df DH |
601 | |
602 | if (skb_copy_bits(skb, nAcks + 3, &ackinfo, sizeof(ackinfo)) < 0) { | |
603 | _leave(" [no ackinfo]"); | |
604 | return; | |
605 | } | |
606 | ||
607 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", | |
608 | latest, | |
609 | ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU), | |
610 | ntohl(ackinfo.rwind), ntohl(ackinfo.jumbo_max)); | |
611 | ||
612 | mtu = min(ntohl(ackinfo.rxMTU), ntohl(ackinfo.maxMTU)); | |
613 | ||
614 | peer = call->conn->trans->peer; | |
615 | if (mtu < peer->maxdata) { | |
616 | spin_lock_bh(&peer->lock); | |
617 | peer->maxdata = mtu; | |
618 | peer->mtu = mtu + peer->hdrsize; | |
619 | spin_unlock_bh(&peer->lock); | |
620 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); | |
621 | } | |
622 | } | |
623 | ||
17926a79 DH |
624 | /* |
625 | * process packets in the reception queue | |
626 | */ | |
627 | static int rxrpc_process_rx_queue(struct rxrpc_call *call, | |
628 | u32 *_abort_code) | |
629 | { | |
630 | struct rxrpc_ackpacket ack; | |
631 | struct rxrpc_skb_priv *sp; | |
632 | struct sk_buff *skb; | |
633 | bool post_ACK; | |
634 | int latest; | |
635 | u32 hard, tx; | |
636 | ||
637 | _enter(""); | |
638 | ||
639 | process_further: | |
640 | skb = skb_dequeue(&call->rx_queue); | |
641 | if (!skb) | |
642 | return -EAGAIN; | |
643 | ||
644 | _net("deferred skb %p", skb); | |
645 | ||
646 | sp = rxrpc_skb(skb); | |
647 | ||
648 | _debug("process %s [st %d]", rxrpc_pkts[sp->hdr.type], call->state); | |
649 | ||
650 | post_ACK = false; | |
651 | ||
652 | switch (sp->hdr.type) { | |
653 | /* data packets that wind up here have been received out of | |
654 | * order, need security processing or are jumbo packets */ | |
655 | case RXRPC_PACKET_TYPE_DATA: | |
0d12f8a4 | 656 | _proto("OOSQ DATA %%%u { #%u }", sp->hdr.serial, sp->hdr.seq); |
17926a79 DH |
657 | |
658 | /* secured packets must be verified and possibly decrypted */ | |
659 | if (rxrpc_verify_packet(call, skb, _abort_code) < 0) | |
660 | goto protocol_error; | |
661 | ||
662 | rxrpc_insert_oos_packet(call, skb); | |
663 | goto process_further; | |
664 | ||
665 | /* partial ACK to process */ | |
666 | case RXRPC_PACKET_TYPE_ACK: | |
667 | if (skb_copy_bits(skb, 0, &ack, sizeof(ack)) < 0) { | |
668 | _debug("extraction failure"); | |
669 | goto protocol_error; | |
670 | } | |
671 | if (!skb_pull(skb, sizeof(ack))) | |
672 | BUG(); | |
673 | ||
0d12f8a4 | 674 | latest = sp->hdr.serial; |
17926a79 DH |
675 | hard = ntohl(ack.firstPacket); |
676 | tx = atomic_read(&call->sequence); | |
677 | ||
678 | _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", | |
679 | latest, | |
680 | ntohs(ack.maxSkew), | |
681 | hard, | |
682 | ntohl(ack.previousPacket), | |
683 | ntohl(ack.serial), | |
08d4d217 | 684 | rxrpc_acks(ack.reason), |
17926a79 DH |
685 | ack.nAcks); |
686 | ||
224711df DH |
687 | rxrpc_extract_ackinfo(call, skb, latest, ack.nAcks); |
688 | ||
17926a79 DH |
689 | if (ack.reason == RXRPC_ACK_PING) { |
690 | _proto("Rx ACK %%%u PING Request", latest); | |
691 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, | |
692 | sp->hdr.serial, true); | |
693 | } | |
694 | ||
695 | /* discard any out-of-order or duplicate ACKs */ | |
696 | if (latest - call->acks_latest <= 0) { | |
697 | _debug("discard ACK %d <= %d", | |
698 | latest, call->acks_latest); | |
699 | goto discard; | |
700 | } | |
701 | call->acks_latest = latest; | |
702 | ||
703 | if (call->state != RXRPC_CALL_CLIENT_SEND_REQUEST && | |
704 | call->state != RXRPC_CALL_CLIENT_AWAIT_REPLY && | |
705 | call->state != RXRPC_CALL_SERVER_SEND_REPLY && | |
706 | call->state != RXRPC_CALL_SERVER_AWAIT_ACK) | |
707 | goto discard; | |
708 | ||
709 | _debug("Tx=%d H=%u S=%d", tx, call->acks_hard, call->state); | |
710 | ||
711 | if (hard > 0) { | |
712 | if (hard - 1 > tx) { | |
713 | _debug("hard-ACK'd packet %d not transmitted" | |
714 | " (%d top)", | |
715 | hard - 1, tx); | |
716 | goto protocol_error; | |
717 | } | |
718 | ||
719 | if ((call->state == RXRPC_CALL_CLIENT_AWAIT_REPLY || | |
720 | call->state == RXRPC_CALL_SERVER_AWAIT_ACK) && | |
33c40e24 DH |
721 | hard > tx) { |
722 | call->acks_hard = tx; | |
17926a79 | 723 | goto all_acked; |
33c40e24 | 724 | } |
17926a79 DH |
725 | |
726 | smp_rmb(); | |
727 | rxrpc_rotate_tx_window(call, hard - 1); | |
728 | } | |
729 | ||
730 | if (ack.nAcks > 0) { | |
731 | if (hard - 1 + ack.nAcks > tx) { | |
732 | _debug("soft-ACK'd packet %d+%d not" | |
733 | " transmitted (%d top)", | |
734 | hard - 1, ack.nAcks, tx); | |
735 | goto protocol_error; | |
736 | } | |
737 | ||
738 | if (rxrpc_process_soft_ACKs(call, &ack, skb) < 0) | |
739 | goto protocol_error; | |
740 | } | |
741 | goto discard; | |
742 | ||
743 | /* complete ACK to process */ | |
744 | case RXRPC_PACKET_TYPE_ACKALL: | |
745 | goto all_acked; | |
746 | ||
747 | /* abort and busy are handled elsewhere */ | |
748 | case RXRPC_PACKET_TYPE_BUSY: | |
749 | case RXRPC_PACKET_TYPE_ABORT: | |
750 | BUG(); | |
751 | ||
752 | /* connection level events - also handled elsewhere */ | |
753 | case RXRPC_PACKET_TYPE_CHALLENGE: | |
754 | case RXRPC_PACKET_TYPE_RESPONSE: | |
755 | case RXRPC_PACKET_TYPE_DEBUG: | |
756 | BUG(); | |
757 | } | |
758 | ||
759 | /* if we've had a hard ACK that covers all the packets we've sent, then | |
760 | * that ends that phase of the operation */ | |
761 | all_acked: | |
762 | write_lock_bh(&call->state_lock); | |
763 | _debug("ack all %d", call->state); | |
764 | ||
765 | switch (call->state) { | |
766 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
767 | call->state = RXRPC_CALL_CLIENT_RECV_REPLY; | |
768 | break; | |
769 | case RXRPC_CALL_SERVER_AWAIT_ACK: | |
770 | _debug("srv complete"); | |
771 | call->state = RXRPC_CALL_COMPLETE; | |
772 | post_ACK = true; | |
773 | break; | |
774 | case RXRPC_CALL_CLIENT_SEND_REQUEST: | |
775 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
776 | goto protocol_error_unlock; /* can't occur yet */ | |
777 | default: | |
778 | write_unlock_bh(&call->state_lock); | |
779 | goto discard; /* assume packet left over from earlier phase */ | |
780 | } | |
781 | ||
782 | write_unlock_bh(&call->state_lock); | |
783 | ||
784 | /* if all the packets we sent are hard-ACK'd, then we can discard | |
785 | * whatever we've got left */ | |
786 | _debug("clear Tx %d", | |
787 | CIRC_CNT(call->acks_head, call->acks_tail, call->acks_winsz)); | |
788 | ||
789 | del_timer_sync(&call->resend_timer); | |
790 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
4c198ad1 | 791 | clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events); |
17926a79 DH |
792 | |
793 | if (call->acks_window) | |
794 | rxrpc_zap_tx_window(call); | |
795 | ||
796 | if (post_ACK) { | |
797 | /* post the final ACK message for userspace to pick up */ | |
798 | _debug("post ACK"); | |
799 | skb->mark = RXRPC_SKB_MARK_FINAL_ACK; | |
800 | sp->call = call; | |
801 | rxrpc_get_call(call); | |
802 | spin_lock_bh(&call->lock); | |
803 | if (rxrpc_queue_rcv_skb(call, skb, true, true) < 0) | |
804 | BUG(); | |
805 | spin_unlock_bh(&call->lock); | |
806 | goto process_further; | |
807 | } | |
808 | ||
809 | discard: | |
810 | rxrpc_free_skb(skb); | |
811 | goto process_further; | |
812 | ||
813 | protocol_error_unlock: | |
814 | write_unlock_bh(&call->state_lock); | |
815 | protocol_error: | |
816 | rxrpc_free_skb(skb); | |
817 | _leave(" = -EPROTO"); | |
818 | return -EPROTO; | |
819 | } | |
820 | ||
821 | /* | |
822 | * post a message to the socket Rx queue for recvmsg() to pick up | |
823 | */ | |
824 | static int rxrpc_post_message(struct rxrpc_call *call, u32 mark, u32 error, | |
825 | bool fatal) | |
826 | { | |
827 | struct rxrpc_skb_priv *sp; | |
828 | struct sk_buff *skb; | |
829 | int ret; | |
830 | ||
831 | _enter("{%d,%lx},%u,%u,%d", | |
832 | call->debug_id, call->flags, mark, error, fatal); | |
833 | ||
834 | /* remove timers and things for fatal messages */ | |
835 | if (fatal) { | |
836 | del_timer_sync(&call->resend_timer); | |
837 | del_timer_sync(&call->ack_timer); | |
838 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
839 | } | |
840 | ||
841 | if (mark != RXRPC_SKB_MARK_NEW_CALL && | |
842 | !test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
843 | _leave("[no userid]"); | |
844 | return 0; | |
845 | } | |
846 | ||
847 | if (!test_bit(RXRPC_CALL_TERMINAL_MSG, &call->flags)) { | |
848 | skb = alloc_skb(0, GFP_NOFS); | |
849 | if (!skb) | |
850 | return -ENOMEM; | |
851 | ||
852 | rxrpc_new_skb(skb); | |
853 | ||
854 | skb->mark = mark; | |
855 | ||
856 | sp = rxrpc_skb(skb); | |
857 | memset(sp, 0, sizeof(*sp)); | |
858 | sp->error = error; | |
859 | sp->call = call; | |
860 | rxrpc_get_call(call); | |
861 | ||
862 | spin_lock_bh(&call->lock); | |
863 | ret = rxrpc_queue_rcv_skb(call, skb, true, fatal); | |
864 | spin_unlock_bh(&call->lock); | |
163e3cb7 | 865 | BUG_ON(ret < 0); |
17926a79 DH |
866 | } |
867 | ||
868 | return 0; | |
869 | } | |
870 | ||
871 | /* | |
872 | * handle background processing of incoming call packets and ACK / abort | |
873 | * generation | |
874 | */ | |
875 | void rxrpc_process_call(struct work_struct *work) | |
876 | { | |
877 | struct rxrpc_call *call = | |
878 | container_of(work, struct rxrpc_call, processor); | |
0d12f8a4 | 879 | struct rxrpc_wire_header whdr; |
17926a79 DH |
880 | struct rxrpc_ackpacket ack; |
881 | struct rxrpc_ackinfo ackinfo; | |
17926a79 DH |
882 | struct msghdr msg; |
883 | struct kvec iov[5]; | |
5b8848d1 | 884 | enum rxrpc_call_event genbit; |
17926a79 | 885 | unsigned long bits; |
224711df | 886 | __be32 data, pad; |
17926a79 | 887 | size_t len; |
5b8848d1 | 888 | int loop, nbit, ioc, ret, mtu; |
0d12f8a4 | 889 | u32 serial, abort_code = RX_PROTOCOL_ERROR; |
17926a79 DH |
890 | u8 *acks = NULL; |
891 | ||
892 | //printk("\n--------------------\n"); | |
893 | _enter("{%d,%s,%lx} [%lu]", | |
894 | call->debug_id, rxrpc_call_states[call->state], call->events, | |
895 | (jiffies - call->creation_jif) / (HZ / 10)); | |
896 | ||
897 | if (test_and_set_bit(RXRPC_CALL_PROC_BUSY, &call->flags)) { | |
898 | _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX"); | |
899 | return; | |
900 | } | |
901 | ||
902 | /* there's a good chance we're going to have to send a message, so set | |
903 | * one up in advance */ | |
904 | msg.msg_name = &call->conn->trans->peer->srx.transport.sin; | |
905 | msg.msg_namelen = sizeof(call->conn->trans->peer->srx.transport.sin); | |
906 | msg.msg_control = NULL; | |
907 | msg.msg_controllen = 0; | |
908 | msg.msg_flags = 0; | |
909 | ||
0d12f8a4 DH |
910 | whdr.epoch = htonl(call->conn->epoch); |
911 | whdr.cid = htonl(call->cid); | |
912 | whdr.callNumber = htonl(call->call_id); | |
913 | whdr.seq = 0; | |
914 | whdr.type = RXRPC_PACKET_TYPE_ACK; | |
915 | whdr.flags = call->conn->out_clientflag; | |
916 | whdr.userStatus = 0; | |
917 | whdr.securityIndex = call->conn->security_ix; | |
918 | whdr._rsvd = 0; | |
919 | whdr.serviceId = htons(call->service_id); | |
17926a79 DH |
920 | |
921 | memset(iov, 0, sizeof(iov)); | |
0d12f8a4 DH |
922 | iov[0].iov_base = &whdr; |
923 | iov[0].iov_len = sizeof(whdr); | |
17926a79 DH |
924 | |
925 | /* deal with events of a final nature */ | |
4c198ad1 | 926 | if (test_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 | 927 | rxrpc_release_call(call); |
4c198ad1 | 928 | clear_bit(RXRPC_CALL_EV_RELEASE, &call->events); |
17926a79 DH |
929 | } |
930 | ||
4c198ad1 | 931 | if (test_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events)) { |
17926a79 DH |
932 | int error; |
933 | ||
4c198ad1 DH |
934 | clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
935 | clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events); | |
936 | clear_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
17926a79 DH |
937 | |
938 | error = call->conn->trans->peer->net_error; | |
939 | _debug("post net error %d", error); | |
940 | ||
941 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NET_ERROR, | |
942 | error, true) < 0) | |
943 | goto no_mem; | |
4c198ad1 | 944 | clear_bit(RXRPC_CALL_EV_RCVD_ERROR, &call->events); |
17926a79 DH |
945 | goto kill_ACKs; |
946 | } | |
947 | ||
4c198ad1 | 948 | if (test_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events)) { |
17926a79 DH |
949 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); |
950 | ||
4c198ad1 DH |
951 | clear_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events); |
952 | clear_bit(RXRPC_CALL_EV_ABORT, &call->events); | |
17926a79 DH |
953 | |
954 | _debug("post conn abort"); | |
955 | ||
956 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
957 | call->conn->error, true) < 0) | |
958 | goto no_mem; | |
4c198ad1 | 959 | clear_bit(RXRPC_CALL_EV_CONN_ABORT, &call->events); |
17926a79 DH |
960 | goto kill_ACKs; |
961 | } | |
962 | ||
4c198ad1 | 963 | if (test_bit(RXRPC_CALL_EV_REJECT_BUSY, &call->events)) { |
0d12f8a4 | 964 | whdr.type = RXRPC_PACKET_TYPE_BUSY; |
4c198ad1 | 965 | genbit = RXRPC_CALL_EV_REJECT_BUSY; |
17926a79 DH |
966 | goto send_message; |
967 | } | |
968 | ||
4c198ad1 | 969 | if (test_bit(RXRPC_CALL_EV_ABORT, &call->events)) { |
17926a79 DH |
970 | ASSERTCMP(call->state, >, RXRPC_CALL_COMPLETE); |
971 | ||
972 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
973 | ECONNABORTED, true) < 0) | |
974 | goto no_mem; | |
0d12f8a4 | 975 | whdr.type = RXRPC_PACKET_TYPE_ABORT; |
17926a79 DH |
976 | data = htonl(call->abort_code); |
977 | iov[1].iov_base = &data; | |
978 | iov[1].iov_len = sizeof(data); | |
4c198ad1 | 979 | genbit = RXRPC_CALL_EV_ABORT; |
17926a79 DH |
980 | goto send_message; |
981 | } | |
982 | ||
4c198ad1 DH |
983 | if (test_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events)) { |
984 | genbit = RXRPC_CALL_EV_ACK_FINAL; | |
224711df DH |
985 | |
986 | ack.bufferSpace = htons(8); | |
987 | ack.maxSkew = 0; | |
988 | ack.serial = 0; | |
989 | ack.reason = RXRPC_ACK_IDLE; | |
990 | ack.nAcks = 0; | |
991 | call->ackr_reason = 0; | |
992 | ||
993 | spin_lock_bh(&call->lock); | |
0d12f8a4 DH |
994 | ack.serial = htonl(call->ackr_serial); |
995 | ack.previousPacket = htonl(call->ackr_prev_seq); | |
996 | ack.firstPacket = htonl(call->rx_data_eaten + 1); | |
224711df DH |
997 | spin_unlock_bh(&call->lock); |
998 | ||
999 | pad = 0; | |
1000 | ||
1001 | iov[1].iov_base = &ack; | |
1002 | iov[1].iov_len = sizeof(ack); | |
1003 | iov[2].iov_base = &pad; | |
1004 | iov[2].iov_len = 3; | |
1005 | iov[3].iov_base = &ackinfo; | |
1006 | iov[3].iov_len = sizeof(ackinfo); | |
1007 | goto send_ACK; | |
17926a79 DH |
1008 | } |
1009 | ||
4c198ad1 DH |
1010 | if (call->events & ((1 << RXRPC_CALL_EV_RCVD_BUSY) | |
1011 | (1 << RXRPC_CALL_EV_RCVD_ABORT)) | |
17926a79 DH |
1012 | ) { |
1013 | u32 mark; | |
1014 | ||
4c198ad1 | 1015 | if (test_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events)) |
17926a79 DH |
1016 | mark = RXRPC_SKB_MARK_REMOTE_ABORT; |
1017 | else | |
1018 | mark = RXRPC_SKB_MARK_BUSY; | |
1019 | ||
1020 | _debug("post abort/busy"); | |
1021 | rxrpc_clear_tx_window(call); | |
1022 | if (rxrpc_post_message(call, mark, ECONNABORTED, true) < 0) | |
1023 | goto no_mem; | |
1024 | ||
4c198ad1 DH |
1025 | clear_bit(RXRPC_CALL_EV_RCVD_BUSY, &call->events); |
1026 | clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); | |
17926a79 DH |
1027 | goto kill_ACKs; |
1028 | } | |
1029 | ||
4c198ad1 | 1030 | if (test_and_clear_bit(RXRPC_CALL_EV_RCVD_ACKALL, &call->events)) { |
17926a79 DH |
1031 | _debug("do implicit ackall"); |
1032 | rxrpc_clear_tx_window(call); | |
1033 | } | |
1034 | ||
4c198ad1 | 1035 | if (test_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events)) { |
17926a79 DH |
1036 | write_lock_bh(&call->state_lock); |
1037 | if (call->state <= RXRPC_CALL_COMPLETE) { | |
1038 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
1039 | call->abort_code = RX_CALL_TIMEOUT; | |
4c198ad1 | 1040 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
17926a79 DH |
1041 | } |
1042 | write_unlock_bh(&call->state_lock); | |
1043 | ||
1044 | _debug("post timeout"); | |
1045 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_LOCAL_ERROR, | |
1046 | ETIME, true) < 0) | |
1047 | goto no_mem; | |
1048 | ||
4c198ad1 | 1049 | clear_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events); |
17926a79 DH |
1050 | goto kill_ACKs; |
1051 | } | |
1052 | ||
1053 | /* deal with assorted inbound messages */ | |
1054 | if (!skb_queue_empty(&call->rx_queue)) { | |
1055 | switch (rxrpc_process_rx_queue(call, &abort_code)) { | |
1056 | case 0: | |
1057 | case -EAGAIN: | |
1058 | break; | |
1059 | case -ENOMEM: | |
1060 | goto no_mem; | |
1061 | case -EKEYEXPIRED: | |
1062 | case -EKEYREJECTED: | |
1063 | case -EPROTO: | |
1064 | rxrpc_abort_call(call, abort_code); | |
1065 | goto kill_ACKs; | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | /* handle resending */ | |
4c198ad1 | 1070 | if (test_and_clear_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events)) |
17926a79 | 1071 | rxrpc_resend_timer(call); |
4c198ad1 | 1072 | if (test_and_clear_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
17926a79 DH |
1073 | rxrpc_resend(call); |
1074 | ||
1075 | /* consider sending an ordinary ACK */ | |
4c198ad1 | 1076 | if (test_bit(RXRPC_CALL_EV_ACK, &call->events)) { |
17926a79 DH |
1077 | _debug("send ACK: window: %d - %d { %lx }", |
1078 | call->rx_data_eaten, call->ackr_win_top, | |
1079 | call->ackr_window[0]); | |
1080 | ||
1081 | if (call->state > RXRPC_CALL_SERVER_ACK_REQUEST && | |
1082 | call->ackr_reason != RXRPC_ACK_PING_RESPONSE) { | |
1083 | /* ACK by sending reply DATA packet in this state */ | |
4c198ad1 | 1084 | clear_bit(RXRPC_CALL_EV_ACK, &call->events); |
17926a79 DH |
1085 | goto maybe_reschedule; |
1086 | } | |
1087 | ||
4c198ad1 | 1088 | genbit = RXRPC_CALL_EV_ACK; |
17926a79 DH |
1089 | |
1090 | acks = kzalloc(call->ackr_win_top - call->rx_data_eaten, | |
1091 | GFP_NOFS); | |
1092 | if (!acks) | |
1093 | goto no_mem; | |
1094 | ||
1095 | //hdr.flags = RXRPC_SLOW_START_OK; | |
1096 | ack.bufferSpace = htons(8); | |
1097 | ack.maxSkew = 0; | |
17926a79 | 1098 | |
17926a79 | 1099 | spin_lock_bh(&call->lock); |
0d12f8a4 DH |
1100 | ack.reason = call->ackr_reason; |
1101 | ack.serial = htonl(call->ackr_serial); | |
1102 | ack.previousPacket = htonl(call->ackr_prev_seq); | |
17926a79 DH |
1103 | ack.firstPacket = htonl(call->rx_data_eaten + 1); |
1104 | ||
1105 | ack.nAcks = 0; | |
1106 | for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { | |
1107 | nbit = loop * BITS_PER_LONG; | |
1108 | for (bits = call->ackr_window[loop]; bits; bits >>= 1 | |
1109 | ) { | |
1110 | _debug("- l=%d n=%d b=%lx", loop, nbit, bits); | |
1111 | if (bits & 1) { | |
1112 | acks[nbit] = RXRPC_ACK_TYPE_ACK; | |
1113 | ack.nAcks = nbit + 1; | |
1114 | } | |
1115 | nbit++; | |
1116 | } | |
1117 | } | |
1118 | call->ackr_reason = 0; | |
1119 | spin_unlock_bh(&call->lock); | |
1120 | ||
1121 | pad = 0; | |
1122 | ||
1123 | iov[1].iov_base = &ack; | |
1124 | iov[1].iov_len = sizeof(ack); | |
1125 | iov[2].iov_base = acks; | |
1126 | iov[2].iov_len = ack.nAcks; | |
1127 | iov[3].iov_base = &pad; | |
1128 | iov[3].iov_len = 3; | |
1129 | iov[4].iov_base = &ackinfo; | |
1130 | iov[4].iov_len = sizeof(ackinfo); | |
1131 | ||
1132 | switch (ack.reason) { | |
1133 | case RXRPC_ACK_REQUESTED: | |
1134 | case RXRPC_ACK_DUPLICATE: | |
1135 | case RXRPC_ACK_OUT_OF_SEQUENCE: | |
1136 | case RXRPC_ACK_EXCEEDS_WINDOW: | |
1137 | case RXRPC_ACK_NOSPACE: | |
1138 | case RXRPC_ACK_PING: | |
1139 | case RXRPC_ACK_PING_RESPONSE: | |
1140 | goto send_ACK_with_skew; | |
1141 | case RXRPC_ACK_DELAY: | |
1142 | case RXRPC_ACK_IDLE: | |
1143 | goto send_ACK; | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | /* handle completion of security negotiations on an incoming | |
1148 | * connection */ | |
4c198ad1 | 1149 | if (test_and_clear_bit(RXRPC_CALL_EV_SECURED, &call->events)) { |
17926a79 DH |
1150 | _debug("secured"); |
1151 | spin_lock_bh(&call->lock); | |
1152 | ||
1153 | if (call->state == RXRPC_CALL_SERVER_SECURING) { | |
1154 | _debug("securing"); | |
1155 | write_lock(&call->conn->lock); | |
1156 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 1157 | !test_bit(RXRPC_CALL_EV_RELEASE, &call->events)) { |
17926a79 DH |
1158 | _debug("not released"); |
1159 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
1160 | list_move_tail(&call->accept_link, | |
1161 | &call->socket->acceptq); | |
1162 | } | |
1163 | write_unlock(&call->conn->lock); | |
1164 | read_lock(&call->state_lock); | |
1165 | if (call->state < RXRPC_CALL_COMPLETE) | |
4c198ad1 | 1166 | set_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events); |
17926a79 DH |
1167 | read_unlock(&call->state_lock); |
1168 | } | |
1169 | ||
1170 | spin_unlock_bh(&call->lock); | |
4c198ad1 | 1171 | if (!test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) |
17926a79 DH |
1172 | goto maybe_reschedule; |
1173 | } | |
1174 | ||
1175 | /* post a notification of an acceptable connection to the app */ | |
4c198ad1 | 1176 | if (test_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events)) { |
17926a79 DH |
1177 | _debug("post accept"); |
1178 | if (rxrpc_post_message(call, RXRPC_SKB_MARK_NEW_CALL, | |
1179 | 0, false) < 0) | |
1180 | goto no_mem; | |
4c198ad1 | 1181 | clear_bit(RXRPC_CALL_EV_POST_ACCEPT, &call->events); |
17926a79 DH |
1182 | goto maybe_reschedule; |
1183 | } | |
1184 | ||
1185 | /* handle incoming call acceptance */ | |
4c198ad1 | 1186 | if (test_and_clear_bit(RXRPC_CALL_EV_ACCEPTED, &call->events)) { |
17926a79 DH |
1187 | _debug("accepted"); |
1188 | ASSERTCMP(call->rx_data_post, ==, 0); | |
1189 | call->rx_data_post = 1; | |
1190 | read_lock_bh(&call->state_lock); | |
1191 | if (call->state < RXRPC_CALL_COMPLETE) | |
4c198ad1 | 1192 | set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events); |
17926a79 DH |
1193 | read_unlock_bh(&call->state_lock); |
1194 | } | |
1195 | ||
1196 | /* drain the out of sequence received packet queue into the packet Rx | |
1197 | * queue */ | |
4c198ad1 | 1198 | if (test_and_clear_bit(RXRPC_CALL_EV_DRAIN_RX_OOS, &call->events)) { |
17926a79 DH |
1199 | while (call->rx_data_post == call->rx_first_oos) |
1200 | if (rxrpc_drain_rx_oos_queue(call) < 0) | |
1201 | break; | |
1202 | goto maybe_reschedule; | |
1203 | } | |
1204 | ||
1205 | /* other events may have been raised since we started checking */ | |
1206 | goto maybe_reschedule; | |
1207 | ||
1208 | send_ACK_with_skew: | |
1209 | ack.maxSkew = htons(atomic_read(&call->conn->hi_serial) - | |
1210 | ntohl(ack.serial)); | |
1211 | send_ACK: | |
224711df DH |
1212 | mtu = call->conn->trans->peer->if_mtu; |
1213 | mtu -= call->conn->trans->peer->hdrsize; | |
1214 | ackinfo.maxMTU = htonl(mtu); | |
817913d8 | 1215 | ackinfo.rwind = htonl(rxrpc_rx_window_size); |
224711df DH |
1216 | |
1217 | /* permit the peer to send us jumbo packets if it wants to */ | |
817913d8 DH |
1218 | ackinfo.rxMTU = htonl(rxrpc_rx_mtu); |
1219 | ackinfo.jumbo_max = htonl(rxrpc_rx_jumbo_max); | |
224711df | 1220 | |
0d12f8a4 DH |
1221 | serial = atomic_inc_return(&call->conn->serial); |
1222 | whdr.serial = htonl(serial); | |
17926a79 | 1223 | _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }", |
0d12f8a4 | 1224 | serial, |
17926a79 DH |
1225 | ntohs(ack.maxSkew), |
1226 | ntohl(ack.firstPacket), | |
1227 | ntohl(ack.previousPacket), | |
1228 | ntohl(ack.serial), | |
08d4d217 | 1229 | rxrpc_acks(ack.reason), |
17926a79 DH |
1230 | ack.nAcks); |
1231 | ||
1232 | del_timer_sync(&call->ack_timer); | |
1233 | if (ack.nAcks > 0) | |
1234 | set_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags); | |
1235 | goto send_message_2; | |
1236 | ||
1237 | send_message: | |
1238 | _debug("send message"); | |
1239 | ||
0d12f8a4 DH |
1240 | serial = atomic_inc_return(&call->conn->serial); |
1241 | whdr.serial = htonl(serial); | |
1242 | _proto("Tx %s %%%u", rxrpc_pkts[whdr.type], serial); | |
17926a79 DH |
1243 | send_message_2: |
1244 | ||
1245 | len = iov[0].iov_len; | |
1246 | ioc = 1; | |
1247 | if (iov[4].iov_len) { | |
1248 | ioc = 5; | |
1249 | len += iov[4].iov_len; | |
1250 | len += iov[3].iov_len; | |
1251 | len += iov[2].iov_len; | |
1252 | len += iov[1].iov_len; | |
1253 | } else if (iov[3].iov_len) { | |
1254 | ioc = 4; | |
1255 | len += iov[3].iov_len; | |
1256 | len += iov[2].iov_len; | |
1257 | len += iov[1].iov_len; | |
1258 | } else if (iov[2].iov_len) { | |
1259 | ioc = 3; | |
1260 | len += iov[2].iov_len; | |
1261 | len += iov[1].iov_len; | |
1262 | } else if (iov[1].iov_len) { | |
1263 | ioc = 2; | |
1264 | len += iov[1].iov_len; | |
1265 | } | |
1266 | ||
1267 | ret = kernel_sendmsg(call->conn->trans->local->socket, | |
1268 | &msg, iov, ioc, len); | |
1269 | if (ret < 0) { | |
1270 | _debug("sendmsg failed: %d", ret); | |
1271 | read_lock_bh(&call->state_lock); | |
1272 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1273 | rxrpc_queue_call(call); |
17926a79 DH |
1274 | read_unlock_bh(&call->state_lock); |
1275 | goto error; | |
1276 | } | |
1277 | ||
1278 | switch (genbit) { | |
4c198ad1 | 1279 | case RXRPC_CALL_EV_ABORT: |
17926a79 | 1280 | clear_bit(genbit, &call->events); |
4c198ad1 | 1281 | clear_bit(RXRPC_CALL_EV_RCVD_ABORT, &call->events); |
17926a79 DH |
1282 | goto kill_ACKs; |
1283 | ||
4c198ad1 | 1284 | case RXRPC_CALL_EV_ACK_FINAL: |
17926a79 DH |
1285 | write_lock_bh(&call->state_lock); |
1286 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) | |
1287 | call->state = RXRPC_CALL_COMPLETE; | |
1288 | write_unlock_bh(&call->state_lock); | |
1289 | goto kill_ACKs; | |
1290 | ||
1291 | default: | |
1292 | clear_bit(genbit, &call->events); | |
1293 | switch (call->state) { | |
1294 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: | |
1295 | case RXRPC_CALL_CLIENT_RECV_REPLY: | |
1296 | case RXRPC_CALL_SERVER_RECV_REQUEST: | |
1297 | case RXRPC_CALL_SERVER_ACK_REQUEST: | |
1298 | _debug("start ACK timer"); | |
1299 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, | |
1300 | call->ackr_serial, false); | |
1301 | default: | |
1302 | break; | |
1303 | } | |
1304 | goto maybe_reschedule; | |
1305 | } | |
1306 | ||
1307 | kill_ACKs: | |
1308 | del_timer_sync(&call->ack_timer); | |
4c198ad1 | 1309 | if (test_and_clear_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events)) |
17926a79 | 1310 | rxrpc_put_call(call); |
4c198ad1 | 1311 | clear_bit(RXRPC_CALL_EV_ACK, &call->events); |
17926a79 DH |
1312 | |
1313 | maybe_reschedule: | |
1314 | if (call->events || !skb_queue_empty(&call->rx_queue)) { | |
1315 | read_lock_bh(&call->state_lock); | |
1316 | if (call->state < RXRPC_CALL_DEAD) | |
651350d1 | 1317 | rxrpc_queue_call(call); |
17926a79 DH |
1318 | read_unlock_bh(&call->state_lock); |
1319 | } | |
1320 | ||
1321 | /* don't leave aborted connections on the accept queue */ | |
1322 | if (call->state >= RXRPC_CALL_COMPLETE && | |
1323 | !list_empty(&call->accept_link)) { | |
1324 | _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }", | |
0d12f8a4 | 1325 | call, call->events, call->flags, call->conn->cid); |
17926a79 DH |
1326 | |
1327 | read_lock_bh(&call->state_lock); | |
1328 | if (!test_bit(RXRPC_CALL_RELEASED, &call->flags) && | |
4c198ad1 | 1329 | !test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
651350d1 | 1330 | rxrpc_queue_call(call); |
17926a79 DH |
1331 | read_unlock_bh(&call->state_lock); |
1332 | } | |
1333 | ||
1334 | error: | |
1335 | clear_bit(RXRPC_CALL_PROC_BUSY, &call->flags); | |
1336 | kfree(acks); | |
1337 | ||
1338 | /* because we don't want two CPUs both processing the work item for one | |
1339 | * call at the same time, we use a flag to note when it's busy; however | |
1340 | * this means there's a race between clearing the flag and setting the | |
1341 | * work pending bit and the work item being processed again */ | |
1342 | if (call->events && !work_pending(&call->processor)) { | |
0d12f8a4 | 1343 | _debug("jumpstart %x", call->conn->cid); |
651350d1 | 1344 | rxrpc_queue_call(call); |
17926a79 DH |
1345 | } |
1346 | ||
1347 | _leave(""); | |
1348 | return; | |
1349 | ||
1350 | no_mem: | |
1351 | _debug("out of memory"); | |
1352 | goto maybe_reschedule; | |
1353 | } |