1 /* Management of Tx window, Tx resend, ACKs and out-of-sequence reception
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14 #include <linux/module.h>
15 #include <linux/circ_buf.h>
16 #include <linux/net.h>
17 #include <linux/skbuff.h>
18 #include <linux/slab.h>
19 #include <linux/udp.h>
21 #include <net/af_rxrpc.h>
22 #include "ar-internal.h"
25 * propose an ACK be sent
27 void __rxrpc_propose_ACK(struct rxrpc_call
*call
, u8 ack_reason
,
28 u32 serial
, bool immediate
)
31 s8 prior
= rxrpc_ack_priority
[ack_reason
];
33 ASSERTCMP(prior
, >, 0);
35 _enter("{%d},%s,%%%x,%u",
36 call
->debug_id
, rxrpc_acks(ack_reason
), serial
, immediate
);
38 if (prior
< rxrpc_ack_priority
[call
->ackr_reason
]) {
44 /* update DELAY, IDLE, REQUESTED and PING_RESPONSE ACK serial
46 if (prior
== rxrpc_ack_priority
[call
->ackr_reason
]) {
48 call
->ackr_serial
= serial
;
54 call
->ackr_reason
= ack_reason
;
55 call
->ackr_serial
= serial
;
59 _debug("run delay timer");
60 expiry
= rxrpc_soft_ack_delay
;
65 _debug("run defer timer");
66 expiry
= rxrpc_idle_ack_delay
;
71 case RXRPC_ACK_REQUESTED
:
72 expiry
= rxrpc_requested_ack_delay
;
75 if (!immediate
|| serial
== 1) {
76 _debug("run defer timer");
81 _debug("immediate ACK");
87 if (!timer_pending(&call
->ack_timer
) ||
88 time_after(call
->ack_timer
.expires
, expiry
))
89 mod_timer(&call
->ack_timer
, expiry
);
93 _debug("cancel timer %%%u", serial
);
94 try_to_del_timer_sync(&call
->ack_timer
);
95 read_lock_bh(&call
->state_lock
);
96 if (call
->state
<= RXRPC_CALL_COMPLETE
&&
97 !test_and_set_bit(RXRPC_CALL_EV_ACK
, &call
->events
))
98 rxrpc_queue_call(call
);
99 read_unlock_bh(&call
->state_lock
);
103 * propose an ACK be sent, locking the call structure
105 void rxrpc_propose_ACK(struct rxrpc_call
*call
, u8 ack_reason
,
106 u32 serial
, bool immediate
)
108 s8 prior
= rxrpc_ack_priority
[ack_reason
];
110 if (prior
> rxrpc_ack_priority
[call
->ackr_reason
]) {
111 spin_lock_bh(&call
->lock
);
112 __rxrpc_propose_ACK(call
, ack_reason
, serial
, immediate
);
113 spin_unlock_bh(&call
->lock
);
118 * set the resend timer
120 static void rxrpc_set_resend(struct rxrpc_call
*call
, u8 resend
,
121 unsigned long resend_at
)
123 read_lock_bh(&call
->state_lock
);
124 if (call
->state
>= RXRPC_CALL_COMPLETE
)
128 _debug("SET RESEND");
129 set_bit(RXRPC_CALL_EV_RESEND
, &call
->events
);
133 _debug("MODIFY RESEND TIMER");
134 set_bit(RXRPC_CALL_RUN_RTIMER
, &call
->flags
);
135 mod_timer(&call
->resend_timer
, resend_at
);
137 _debug("KILL RESEND TIMER");
138 del_timer_sync(&call
->resend_timer
);
139 clear_bit(RXRPC_CALL_EV_RESEND_TIMER
, &call
->events
);
140 clear_bit(RXRPC_CALL_RUN_RTIMER
, &call
->flags
);
142 read_unlock_bh(&call
->state_lock
);
148 static void rxrpc_resend(struct rxrpc_call
*call
)
150 struct rxrpc_wire_header
*whdr
;
151 struct rxrpc_skb_priv
*sp
;
153 unsigned long *p_txb
, resend_at
;
158 _enter("{%d,%d,%d,%d},",
159 call
->acks_hard
, call
->acks_unacked
,
160 atomic_read(&call
->sequence
),
161 CIRC_CNT(call
->acks_head
, call
->acks_tail
, call
->acks_winsz
));
167 for (loop
= call
->acks_tail
;
168 loop
!= call
->acks_head
|| stop
;
169 loop
= (loop
+ 1) & (call
->acks_winsz
- 1)
171 p_txb
= call
->acks_window
+ loop
;
172 smp_read_barrier_depends();
176 txb
= (struct sk_buff
*) *p_txb
;
179 if (sp
->need_resend
) {
180 sp
->need_resend
= false;
182 /* each Tx packet has a new serial number */
183 sp
->hdr
.serial
= atomic_inc_return(&call
->conn
->serial
);
185 whdr
= (struct rxrpc_wire_header
*)txb
->head
;
186 whdr
->serial
= htonl(sp
->hdr
.serial
);
188 _proto("Tx DATA %%%u { #%d }",
189 sp
->hdr
.serial
, sp
->hdr
.seq
);
190 if (rxrpc_send_data_packet(call
->conn
, txb
) < 0) {
192 sp
->resend_at
= jiffies
+ 3;
195 jiffies
+ rxrpc_resend_timeout
;
199 if (time_after_eq(jiffies
+ 1, sp
->resend_at
)) {
200 sp
->need_resend
= true;
202 } else if (resend
& 2) {
203 if (time_before(sp
->resend_at
, resend_at
))
204 resend_at
= sp
->resend_at
;
206 resend_at
= sp
->resend_at
;
211 rxrpc_set_resend(call
, resend
, resend_at
);
216 * handle resend timer expiry
218 static void rxrpc_resend_timer(struct rxrpc_call
*call
)
220 struct rxrpc_skb_priv
*sp
;
222 unsigned long *p_txb
, resend_at
;
227 call
->acks_tail
, call
->acks_unacked
, call
->acks_head
);
229 if (call
->state
>= RXRPC_CALL_COMPLETE
)
235 for (loop
= call
->acks_unacked
;
236 loop
!= call
->acks_head
;
237 loop
= (loop
+ 1) & (call
->acks_winsz
- 1)
239 p_txb
= call
->acks_window
+ loop
;
240 smp_read_barrier_depends();
241 txb
= (struct sk_buff
*) (*p_txb
& ~1);
244 ASSERT(!(*p_txb
& 1));
246 if (sp
->need_resend
) {
248 } else if (time_after_eq(jiffies
+ 1, sp
->resend_at
)) {
249 sp
->need_resend
= true;
251 } else if (resend
& 2) {
252 if (time_before(sp
->resend_at
, resend_at
))
253 resend_at
= sp
->resend_at
;
255 resend_at
= sp
->resend_at
;
260 rxrpc_set_resend(call
, resend
, resend_at
);
265 * process soft ACKs of our transmitted packets
266 * - these indicate packets the peer has or has not received, but hasn't yet
267 * given to the consumer, and so can still be discarded and re-requested
269 static int rxrpc_process_soft_ACKs(struct rxrpc_call
*call
,
270 struct rxrpc_ackpacket
*ack
,
273 struct rxrpc_skb_priv
*sp
;
275 unsigned long *p_txb
, resend_at
;
277 u8 sacks
[RXRPC_MAXACKS
], resend
;
279 _enter("{%d,%d},{%d},",
281 CIRC_CNT(call
->acks_head
, call
->acks_tail
, call
->acks_winsz
),
284 if (skb_copy_bits(skb
, 0, sacks
, ack
->nAcks
) < 0)
289 for (loop
= 0; loop
< ack
->nAcks
; loop
++) {
290 p_txb
= call
->acks_window
;
291 p_txb
+= (call
->acks_tail
+ loop
) & (call
->acks_winsz
- 1);
292 smp_read_barrier_depends();
293 txb
= (struct sk_buff
*) (*p_txb
& ~1);
296 switch (sacks
[loop
]) {
297 case RXRPC_ACK_TYPE_ACK
:
298 sp
->need_resend
= false;
301 case RXRPC_ACK_TYPE_NACK
:
302 sp
->need_resend
= true;
307 _debug("Unsupported ACK type %d", sacks
[loop
]);
313 call
->acks_unacked
= (call
->acks_tail
+ loop
) & (call
->acks_winsz
- 1);
315 /* anything not explicitly ACK'd is implicitly NACK'd, but may just not
316 * have been received or processed yet by the far end */
317 for (loop
= call
->acks_unacked
;
318 loop
!= call
->acks_head
;
319 loop
= (loop
+ 1) & (call
->acks_winsz
- 1)
321 p_txb
= call
->acks_window
+ loop
;
322 smp_read_barrier_depends();
323 txb
= (struct sk_buff
*) (*p_txb
& ~1);
327 /* packet must have been discarded */
328 sp
->need_resend
= true;
331 } else if (sp
->need_resend
) {
333 } else if (time_after_eq(jiffies
+ 1, sp
->resend_at
)) {
334 sp
->need_resend
= true;
336 } else if (resend
& 2) {
337 if (time_before(sp
->resend_at
, resend_at
))
338 resend_at
= sp
->resend_at
;
340 resend_at
= sp
->resend_at
;
345 rxrpc_set_resend(call
, resend
, resend_at
);
350 _leave(" = -EPROTO");
355 * discard hard-ACK'd packets from the Tx window
357 static void rxrpc_rotate_tx_window(struct rxrpc_call
*call
, u32 hard
)
360 int tail
= call
->acks_tail
, old_tail
;
361 int win
= CIRC_CNT(call
->acks_head
, tail
, call
->acks_winsz
);
363 _enter("{%u,%u},%u", call
->acks_hard
, win
, hard
);
365 ASSERTCMP(hard
- call
->acks_hard
, <=, win
);
367 while (call
->acks_hard
< hard
) {
368 smp_read_barrier_depends();
369 _skb
= call
->acks_window
[tail
] & ~1;
370 rxrpc_free_skb((struct sk_buff
*) _skb
);
372 tail
= (tail
+ 1) & (call
->acks_winsz
- 1);
373 call
->acks_tail
= tail
;
374 if (call
->acks_unacked
== old_tail
)
375 call
->acks_unacked
= tail
;
379 wake_up(&call
->tx_waitq
);
383 * clear the Tx window in the event of a failure
385 static void rxrpc_clear_tx_window(struct rxrpc_call
*call
)
387 rxrpc_rotate_tx_window(call
, atomic_read(&call
->sequence
));
391 * drain the out of sequence received packet queue into the packet Rx queue
393 static int rxrpc_drain_rx_oos_queue(struct rxrpc_call
*call
)
395 struct rxrpc_skb_priv
*sp
;
400 _enter("{%d,%d}", call
->rx_data_post
, call
->rx_first_oos
);
402 spin_lock_bh(&call
->lock
);
405 if (test_bit(RXRPC_CALL_RELEASED
, &call
->flags
))
406 goto socket_unavailable
;
408 skb
= skb_dequeue(&call
->rx_oos_queue
);
412 _debug("drain OOS packet %d [%d]",
413 sp
->hdr
.seq
, call
->rx_first_oos
);
415 if (sp
->hdr
.seq
!= call
->rx_first_oos
) {
416 skb_queue_head(&call
->rx_oos_queue
, skb
);
417 call
->rx_first_oos
= rxrpc_skb(skb
)->hdr
.seq
;
418 _debug("requeue %p {%u}", skb
, call
->rx_first_oos
);
420 skb
->mark
= RXRPC_SKB_MARK_DATA
;
421 terminal
= ((sp
->hdr
.flags
& RXRPC_LAST_PACKET
) &&
422 !(sp
->hdr
.flags
& RXRPC_CLIENT_INITIATED
));
423 ret
= rxrpc_queue_rcv_skb(call
, skb
, true, terminal
);
425 _debug("drain #%u", call
->rx_data_post
);
426 call
->rx_data_post
++;
428 /* find out what the next packet is */
429 skb
= skb_peek(&call
->rx_oos_queue
);
431 call
->rx_first_oos
= rxrpc_skb(skb
)->hdr
.seq
;
433 call
->rx_first_oos
= 0;
434 _debug("peek %p {%u}", skb
, call
->rx_first_oos
);
440 spin_unlock_bh(&call
->lock
);
441 _leave(" = %d", ret
);
446 * insert an out of sequence packet into the buffer
448 static void rxrpc_insert_oos_packet(struct rxrpc_call
*call
,
451 struct rxrpc_skb_priv
*sp
, *psp
;
457 _enter(",,{%u}", seq
);
459 skb
->destructor
= rxrpc_packet_destructor
;
460 ASSERTCMP(sp
->call
, ==, NULL
);
462 rxrpc_get_call(call
);
464 /* insert into the buffer in sequence order */
465 spin_lock_bh(&call
->lock
);
467 skb_queue_walk(&call
->rx_oos_queue
, p
) {
469 if (psp
->hdr
.seq
> seq
) {
470 _debug("insert oos #%u before #%u", seq
, psp
->hdr
.seq
);
471 skb_insert(p
, skb
, &call
->rx_oos_queue
);
476 _debug("append oos #%u", seq
);
477 skb_queue_tail(&call
->rx_oos_queue
, skb
);
480 /* we might now have a new front to the queue */
481 if (call
->rx_first_oos
== 0 || seq
< call
->rx_first_oos
)
482 call
->rx_first_oos
= seq
;
484 read_lock(&call
->state_lock
);
485 if (call
->state
< RXRPC_CALL_COMPLETE
&&
486 call
->rx_data_post
== call
->rx_first_oos
) {
487 _debug("drain rx oos now");
488 set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS
, &call
->events
);
490 read_unlock(&call
->state_lock
);
492 spin_unlock_bh(&call
->lock
);
493 _leave(" [stored #%u]", call
->rx_first_oos
);
497 * clear the Tx window on final ACK reception
499 static void rxrpc_zap_tx_window(struct rxrpc_call
*call
)
501 struct rxrpc_skb_priv
*sp
;
503 unsigned long _skb
, *acks_window
;
504 u8 winsz
= call
->acks_winsz
;
507 acks_window
= call
->acks_window
;
508 call
->acks_window
= NULL
;
510 while (CIRC_CNT(call
->acks_head
, call
->acks_tail
, winsz
) > 0) {
511 tail
= call
->acks_tail
;
512 smp_read_barrier_depends();
513 _skb
= acks_window
[tail
] & ~1;
515 call
->acks_tail
= (call
->acks_tail
+ 1) & (winsz
- 1);
517 skb
= (struct sk_buff
*) _skb
;
519 _debug("+++ clear Tx %u", sp
->hdr
.seq
);
527 * process the extra information that may be appended to an ACK packet
529 static void rxrpc_extract_ackinfo(struct rxrpc_call
*call
, struct sk_buff
*skb
,
530 unsigned int latest
, int nAcks
)
532 struct rxrpc_ackinfo ackinfo
;
533 struct rxrpc_peer
*peer
;
536 if (skb_copy_bits(skb
, nAcks
+ 3, &ackinfo
, sizeof(ackinfo
)) < 0) {
537 _leave(" [no ackinfo]");
541 _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }",
543 ntohl(ackinfo
.rxMTU
), ntohl(ackinfo
.maxMTU
),
544 ntohl(ackinfo
.rwind
), ntohl(ackinfo
.jumbo_max
));
546 mtu
= min(ntohl(ackinfo
.rxMTU
), ntohl(ackinfo
.maxMTU
));
548 peer
= call
->conn
->params
.peer
;
549 if (mtu
< peer
->maxdata
) {
550 spin_lock_bh(&peer
->lock
);
552 peer
->mtu
= mtu
+ peer
->hdrsize
;
553 spin_unlock_bh(&peer
->lock
);
554 _net("Net MTU %u (maxdata %u)", peer
->mtu
, peer
->maxdata
);
559 * process packets in the reception queue
561 static int rxrpc_process_rx_queue(struct rxrpc_call
*call
,
564 struct rxrpc_ackpacket ack
;
565 struct rxrpc_skb_priv
*sp
;
574 skb
= skb_dequeue(&call
->rx_queue
);
578 _net("deferred skb %p", skb
);
582 _debug("process %s [st %d]", rxrpc_pkts
[sp
->hdr
.type
], call
->state
);
586 switch (sp
->hdr
.type
) {
587 /* data packets that wind up here have been received out of
588 * order, need security processing or are jumbo packets */
589 case RXRPC_PACKET_TYPE_DATA
:
590 _proto("OOSQ DATA %%%u { #%u }", sp
->hdr
.serial
, sp
->hdr
.seq
);
592 /* secured packets must be verified and possibly decrypted */
593 if (call
->conn
->security
->verify_packet(call
, skb
,
597 rxrpc_insert_oos_packet(call
, skb
);
598 goto process_further
;
600 /* partial ACK to process */
601 case RXRPC_PACKET_TYPE_ACK
:
602 if (skb_copy_bits(skb
, 0, &ack
, sizeof(ack
)) < 0) {
603 _debug("extraction failure");
606 if (!skb_pull(skb
, sizeof(ack
)))
609 latest
= sp
->hdr
.serial
;
610 hard
= ntohl(ack
.firstPacket
);
611 tx
= atomic_read(&call
->sequence
);
613 _proto("Rx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
617 ntohl(ack
.previousPacket
),
619 rxrpc_acks(ack
.reason
),
622 rxrpc_extract_ackinfo(call
, skb
, latest
, ack
.nAcks
);
624 if (ack
.reason
== RXRPC_ACK_PING
) {
625 _proto("Rx ACK %%%u PING Request", latest
);
626 rxrpc_propose_ACK(call
, RXRPC_ACK_PING_RESPONSE
,
627 sp
->hdr
.serial
, true);
630 /* discard any out-of-order or duplicate ACKs */
631 if (latest
- call
->acks_latest
<= 0) {
632 _debug("discard ACK %d <= %d",
633 latest
, call
->acks_latest
);
636 call
->acks_latest
= latest
;
638 if (call
->state
!= RXRPC_CALL_CLIENT_SEND_REQUEST
&&
639 call
->state
!= RXRPC_CALL_CLIENT_AWAIT_REPLY
&&
640 call
->state
!= RXRPC_CALL_SERVER_SEND_REPLY
&&
641 call
->state
!= RXRPC_CALL_SERVER_AWAIT_ACK
)
644 _debug("Tx=%d H=%u S=%d", tx
, call
->acks_hard
, call
->state
);
648 _debug("hard-ACK'd packet %d not transmitted"
654 if ((call
->state
== RXRPC_CALL_CLIENT_AWAIT_REPLY
||
655 call
->state
== RXRPC_CALL_SERVER_AWAIT_ACK
) &&
657 call
->acks_hard
= tx
;
662 rxrpc_rotate_tx_window(call
, hard
- 1);
666 if (hard
- 1 + ack
.nAcks
> tx
) {
667 _debug("soft-ACK'd packet %d+%d not"
668 " transmitted (%d top)",
669 hard
- 1, ack
.nAcks
, tx
);
673 if (rxrpc_process_soft_ACKs(call
, &ack
, skb
) < 0)
678 /* complete ACK to process */
679 case RXRPC_PACKET_TYPE_ACKALL
:
682 /* abort and busy are handled elsewhere */
683 case RXRPC_PACKET_TYPE_BUSY
:
684 case RXRPC_PACKET_TYPE_ABORT
:
687 /* connection level events - also handled elsewhere */
688 case RXRPC_PACKET_TYPE_CHALLENGE
:
689 case RXRPC_PACKET_TYPE_RESPONSE
:
690 case RXRPC_PACKET_TYPE_DEBUG
:
694 /* if we've had a hard ACK that covers all the packets we've sent, then
695 * that ends that phase of the operation */
697 write_lock_bh(&call
->state_lock
);
698 _debug("ack all %d", call
->state
);
700 switch (call
->state
) {
701 case RXRPC_CALL_CLIENT_AWAIT_REPLY
:
702 call
->state
= RXRPC_CALL_CLIENT_RECV_REPLY
;
704 case RXRPC_CALL_SERVER_AWAIT_ACK
:
705 _debug("srv complete");
706 call
->state
= RXRPC_CALL_COMPLETE
;
709 case RXRPC_CALL_CLIENT_SEND_REQUEST
:
710 case RXRPC_CALL_SERVER_RECV_REQUEST
:
711 goto protocol_error_unlock
; /* can't occur yet */
713 write_unlock_bh(&call
->state_lock
);
714 goto discard
; /* assume packet left over from earlier phase */
717 write_unlock_bh(&call
->state_lock
);
719 /* if all the packets we sent are hard-ACK'd, then we can discard
720 * whatever we've got left */
721 _debug("clear Tx %d",
722 CIRC_CNT(call
->acks_head
, call
->acks_tail
, call
->acks_winsz
));
724 del_timer_sync(&call
->resend_timer
);
725 clear_bit(RXRPC_CALL_RUN_RTIMER
, &call
->flags
);
726 clear_bit(RXRPC_CALL_EV_RESEND_TIMER
, &call
->events
);
728 if (call
->acks_window
)
729 rxrpc_zap_tx_window(call
);
732 /* post the final ACK message for userspace to pick up */
734 skb
->mark
= RXRPC_SKB_MARK_FINAL_ACK
;
736 rxrpc_get_call(call
);
737 spin_lock_bh(&call
->lock
);
738 if (rxrpc_queue_rcv_skb(call
, skb
, true, true) < 0)
740 spin_unlock_bh(&call
->lock
);
741 goto process_further
;
746 goto process_further
;
748 protocol_error_unlock
:
749 write_unlock_bh(&call
->state_lock
);
752 _leave(" = -EPROTO");
757 * post a message to the socket Rx queue for recvmsg() to pick up
759 static int rxrpc_post_message(struct rxrpc_call
*call
, u32 mark
, u32 error
,
762 struct rxrpc_skb_priv
*sp
;
766 _enter("{%d,%lx},%u,%u,%d",
767 call
->debug_id
, call
->flags
, mark
, error
, fatal
);
769 /* remove timers and things for fatal messages */
771 del_timer_sync(&call
->resend_timer
);
772 del_timer_sync(&call
->ack_timer
);
773 clear_bit(RXRPC_CALL_RUN_RTIMER
, &call
->flags
);
776 if (mark
!= RXRPC_SKB_MARK_NEW_CALL
&&
777 !test_bit(RXRPC_CALL_HAS_USERID
, &call
->flags
)) {
778 _leave("[no userid]");
782 if (!test_bit(RXRPC_CALL_TERMINAL_MSG
, &call
->flags
)) {
783 skb
= alloc_skb(0, GFP_NOFS
);
792 memset(sp
, 0, sizeof(*sp
));
795 rxrpc_get_call(call
);
797 spin_lock_bh(&call
->lock
);
798 ret
= rxrpc_queue_rcv_skb(call
, skb
, true, fatal
);
799 spin_unlock_bh(&call
->lock
);
807 * handle background processing of incoming call packets and ACK / abort
810 void rxrpc_process_call(struct work_struct
*work
)
812 struct rxrpc_call
*call
=
813 container_of(work
, struct rxrpc_call
, processor
);
814 struct rxrpc_wire_header whdr
;
815 struct rxrpc_ackpacket ack
;
816 struct rxrpc_ackinfo ackinfo
;
819 enum rxrpc_call_event genbit
;
823 int loop
, nbit
, ioc
, ret
, mtu
;
824 u32 serial
, abort_code
= RX_PROTOCOL_ERROR
;
827 //printk("\n--------------------\n");
828 _enter("{%d,%s,%lx} [%lu]",
829 call
->debug_id
, rxrpc_call_states
[call
->state
], call
->events
,
830 (jiffies
- call
->creation_jif
) / (HZ
/ 10));
832 if (test_and_set_bit(RXRPC_CALL_PROC_BUSY
, &call
->flags
)) {
833 _debug("XXXXXXXXXXXXX RUNNING ON MULTIPLE CPUS XXXXXXXXXXXXX");
837 /* there's a good chance we're going to have to send a message, so set
838 * one up in advance */
839 msg
.msg_name
= &call
->conn
->params
.peer
->srx
.transport
;
840 msg
.msg_namelen
= call
->conn
->params
.peer
->srx
.transport_len
;
841 msg
.msg_control
= NULL
;
842 msg
.msg_controllen
= 0;
845 whdr
.epoch
= htonl(call
->conn
->proto
.epoch
);
846 whdr
.cid
= htonl(call
->cid
);
847 whdr
.callNumber
= htonl(call
->call_id
);
849 whdr
.type
= RXRPC_PACKET_TYPE_ACK
;
850 whdr
.flags
= call
->conn
->out_clientflag
;
852 whdr
.securityIndex
= call
->conn
->security_ix
;
854 whdr
.serviceId
= htons(call
->service_id
);
856 memset(iov
, 0, sizeof(iov
));
857 iov
[0].iov_base
= &whdr
;
858 iov
[0].iov_len
= sizeof(whdr
);
860 /* deal with events of a final nature */
861 if (test_bit(RXRPC_CALL_EV_RCVD_ERROR
, &call
->events
)) {
862 enum rxrpc_skb_mark mark
;
865 clear_bit(RXRPC_CALL_EV_CONN_ABORT
, &call
->events
);
866 clear_bit(RXRPC_CALL_EV_REJECT_BUSY
, &call
->events
);
867 clear_bit(RXRPC_CALL_EV_ABORT
, &call
->events
);
869 error
= call
->error_report
;
870 if (error
< RXRPC_LOCAL_ERROR_OFFSET
) {
871 mark
= RXRPC_SKB_MARK_NET_ERROR
;
872 _debug("post net error %d", error
);
874 mark
= RXRPC_SKB_MARK_LOCAL_ERROR
;
875 error
-= RXRPC_LOCAL_ERROR_OFFSET
;
876 _debug("post net local error %d", error
);
879 if (rxrpc_post_message(call
, mark
, error
, true) < 0)
881 clear_bit(RXRPC_CALL_EV_RCVD_ERROR
, &call
->events
);
885 if (test_bit(RXRPC_CALL_EV_CONN_ABORT
, &call
->events
)) {
886 ASSERTCMP(call
->state
, >, RXRPC_CALL_COMPLETE
);
888 clear_bit(RXRPC_CALL_EV_REJECT_BUSY
, &call
->events
);
889 clear_bit(RXRPC_CALL_EV_ABORT
, &call
->events
);
891 _debug("post conn abort");
893 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_LOCAL_ERROR
,
894 call
->conn
->error
, true) < 0)
896 clear_bit(RXRPC_CALL_EV_CONN_ABORT
, &call
->events
);
900 if (test_bit(RXRPC_CALL_EV_REJECT_BUSY
, &call
->events
)) {
901 whdr
.type
= RXRPC_PACKET_TYPE_BUSY
;
902 genbit
= RXRPC_CALL_EV_REJECT_BUSY
;
906 if (test_bit(RXRPC_CALL_EV_ABORT
, &call
->events
)) {
907 ASSERTCMP(call
->state
, >, RXRPC_CALL_COMPLETE
);
909 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_LOCAL_ERROR
,
910 ECONNABORTED
, true) < 0)
912 whdr
.type
= RXRPC_PACKET_TYPE_ABORT
;
913 data
= htonl(call
->local_abort
);
914 iov
[1].iov_base
= &data
;
915 iov
[1].iov_len
= sizeof(data
);
916 genbit
= RXRPC_CALL_EV_ABORT
;
920 if (test_bit(RXRPC_CALL_EV_ACK_FINAL
, &call
->events
)) {
921 genbit
= RXRPC_CALL_EV_ACK_FINAL
;
923 ack
.bufferSpace
= htons(8);
926 ack
.reason
= RXRPC_ACK_IDLE
;
928 call
->ackr_reason
= 0;
930 spin_lock_bh(&call
->lock
);
931 ack
.serial
= htonl(call
->ackr_serial
);
932 ack
.previousPacket
= htonl(call
->ackr_prev_seq
);
933 ack
.firstPacket
= htonl(call
->rx_data_eaten
+ 1);
934 spin_unlock_bh(&call
->lock
);
938 iov
[1].iov_base
= &ack
;
939 iov
[1].iov_len
= sizeof(ack
);
940 iov
[2].iov_base
= &pad
;
942 iov
[3].iov_base
= &ackinfo
;
943 iov
[3].iov_len
= sizeof(ackinfo
);
947 if (call
->events
& ((1 << RXRPC_CALL_EV_RCVD_BUSY
) |
948 (1 << RXRPC_CALL_EV_RCVD_ABORT
))
952 if (test_bit(RXRPC_CALL_EV_RCVD_ABORT
, &call
->events
))
953 mark
= RXRPC_SKB_MARK_REMOTE_ABORT
;
955 mark
= RXRPC_SKB_MARK_BUSY
;
957 _debug("post abort/busy");
958 rxrpc_clear_tx_window(call
);
959 if (rxrpc_post_message(call
, mark
, ECONNABORTED
, true) < 0)
962 clear_bit(RXRPC_CALL_EV_RCVD_BUSY
, &call
->events
);
963 clear_bit(RXRPC_CALL_EV_RCVD_ABORT
, &call
->events
);
967 if (test_and_clear_bit(RXRPC_CALL_EV_RCVD_ACKALL
, &call
->events
)) {
968 _debug("do implicit ackall");
969 rxrpc_clear_tx_window(call
);
972 if (test_bit(RXRPC_CALL_EV_LIFE_TIMER
, &call
->events
)) {
973 write_lock_bh(&call
->state_lock
);
974 if (call
->state
<= RXRPC_CALL_COMPLETE
) {
975 call
->state
= RXRPC_CALL_LOCALLY_ABORTED
;
976 call
->local_abort
= RX_CALL_TIMEOUT
;
977 set_bit(RXRPC_CALL_EV_ABORT
, &call
->events
);
979 write_unlock_bh(&call
->state_lock
);
981 _debug("post timeout");
982 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_LOCAL_ERROR
,
986 clear_bit(RXRPC_CALL_EV_LIFE_TIMER
, &call
->events
);
990 /* deal with assorted inbound messages */
991 if (!skb_queue_empty(&call
->rx_queue
)) {
992 switch (rxrpc_process_rx_queue(call
, &abort_code
)) {
1001 rxrpc_abort_call(call
, abort_code
);
1006 /* handle resending */
1007 if (test_and_clear_bit(RXRPC_CALL_EV_RESEND_TIMER
, &call
->events
))
1008 rxrpc_resend_timer(call
);
1009 if (test_and_clear_bit(RXRPC_CALL_EV_RESEND
, &call
->events
))
1012 /* consider sending an ordinary ACK */
1013 if (test_bit(RXRPC_CALL_EV_ACK
, &call
->events
)) {
1014 _debug("send ACK: window: %d - %d { %lx }",
1015 call
->rx_data_eaten
, call
->ackr_win_top
,
1016 call
->ackr_window
[0]);
1018 if (call
->state
> RXRPC_CALL_SERVER_ACK_REQUEST
&&
1019 call
->ackr_reason
!= RXRPC_ACK_PING_RESPONSE
) {
1020 /* ACK by sending reply DATA packet in this state */
1021 clear_bit(RXRPC_CALL_EV_ACK
, &call
->events
);
1022 goto maybe_reschedule
;
1025 genbit
= RXRPC_CALL_EV_ACK
;
1027 acks
= kzalloc(call
->ackr_win_top
- call
->rx_data_eaten
,
1032 //hdr.flags = RXRPC_SLOW_START_OK;
1033 ack
.bufferSpace
= htons(8);
1036 spin_lock_bh(&call
->lock
);
1037 ack
.reason
= call
->ackr_reason
;
1038 ack
.serial
= htonl(call
->ackr_serial
);
1039 ack
.previousPacket
= htonl(call
->ackr_prev_seq
);
1040 ack
.firstPacket
= htonl(call
->rx_data_eaten
+ 1);
1043 for (loop
= 0; loop
< RXRPC_ACKR_WINDOW_ASZ
; loop
++) {
1044 nbit
= loop
* BITS_PER_LONG
;
1045 for (bits
= call
->ackr_window
[loop
]; bits
; bits
>>= 1
1047 _debug("- l=%d n=%d b=%lx", loop
, nbit
, bits
);
1049 acks
[nbit
] = RXRPC_ACK_TYPE_ACK
;
1050 ack
.nAcks
= nbit
+ 1;
1055 call
->ackr_reason
= 0;
1056 spin_unlock_bh(&call
->lock
);
1060 iov
[1].iov_base
= &ack
;
1061 iov
[1].iov_len
= sizeof(ack
);
1062 iov
[2].iov_base
= acks
;
1063 iov
[2].iov_len
= ack
.nAcks
;
1064 iov
[3].iov_base
= &pad
;
1066 iov
[4].iov_base
= &ackinfo
;
1067 iov
[4].iov_len
= sizeof(ackinfo
);
1069 switch (ack
.reason
) {
1070 case RXRPC_ACK_REQUESTED
:
1071 case RXRPC_ACK_DUPLICATE
:
1072 case RXRPC_ACK_OUT_OF_SEQUENCE
:
1073 case RXRPC_ACK_EXCEEDS_WINDOW
:
1074 case RXRPC_ACK_NOSPACE
:
1075 case RXRPC_ACK_PING
:
1076 case RXRPC_ACK_PING_RESPONSE
:
1077 goto send_ACK_with_skew
;
1078 case RXRPC_ACK_DELAY
:
1079 case RXRPC_ACK_IDLE
:
1084 /* handle completion of security negotiations on an incoming
1086 if (test_and_clear_bit(RXRPC_CALL_EV_SECURED
, &call
->events
)) {
1088 spin_lock_bh(&call
->lock
);
1090 if (call
->state
== RXRPC_CALL_SERVER_SECURING
) {
1092 write_lock(&call
->socket
->call_lock
);
1093 if (!test_bit(RXRPC_CALL_RELEASED
, &call
->flags
) &&
1094 !test_bit(RXRPC_CALL_EV_RELEASE
, &call
->events
)) {
1095 _debug("not released");
1096 call
->state
= RXRPC_CALL_SERVER_ACCEPTING
;
1097 list_move_tail(&call
->accept_link
,
1098 &call
->socket
->acceptq
);
1100 write_unlock(&call
->socket
->call_lock
);
1101 read_lock(&call
->state_lock
);
1102 if (call
->state
< RXRPC_CALL_COMPLETE
)
1103 set_bit(RXRPC_CALL_EV_POST_ACCEPT
, &call
->events
);
1104 read_unlock(&call
->state_lock
);
1107 spin_unlock_bh(&call
->lock
);
1108 if (!test_bit(RXRPC_CALL_EV_POST_ACCEPT
, &call
->events
))
1109 goto maybe_reschedule
;
1112 /* post a notification of an acceptable connection to the app */
1113 if (test_bit(RXRPC_CALL_EV_POST_ACCEPT
, &call
->events
)) {
1114 _debug("post accept");
1115 if (rxrpc_post_message(call
, RXRPC_SKB_MARK_NEW_CALL
,
1118 clear_bit(RXRPC_CALL_EV_POST_ACCEPT
, &call
->events
);
1119 goto maybe_reschedule
;
1122 /* handle incoming call acceptance */
1123 if (test_and_clear_bit(RXRPC_CALL_EV_ACCEPTED
, &call
->events
)) {
1125 ASSERTCMP(call
->rx_data_post
, ==, 0);
1126 call
->rx_data_post
= 1;
1127 read_lock_bh(&call
->state_lock
);
1128 if (call
->state
< RXRPC_CALL_COMPLETE
)
1129 set_bit(RXRPC_CALL_EV_DRAIN_RX_OOS
, &call
->events
);
1130 read_unlock_bh(&call
->state_lock
);
1133 /* drain the out of sequence received packet queue into the packet Rx
1135 if (test_and_clear_bit(RXRPC_CALL_EV_DRAIN_RX_OOS
, &call
->events
)) {
1136 while (call
->rx_data_post
== call
->rx_first_oos
)
1137 if (rxrpc_drain_rx_oos_queue(call
) < 0)
1139 goto maybe_reschedule
;
1142 if (test_bit(RXRPC_CALL_EV_RELEASE
, &call
->events
)) {
1143 rxrpc_release_call(call
);
1144 clear_bit(RXRPC_CALL_EV_RELEASE
, &call
->events
);
1147 /* other events may have been raised since we started checking */
1148 goto maybe_reschedule
;
1151 ack
.maxSkew
= htons(atomic_read(&call
->conn
->hi_serial
) -
1154 mtu
= call
->conn
->params
.peer
->if_mtu
;
1155 mtu
-= call
->conn
->params
.peer
->hdrsize
;
1156 ackinfo
.maxMTU
= htonl(mtu
);
1157 ackinfo
.rwind
= htonl(rxrpc_rx_window_size
);
1159 /* permit the peer to send us jumbo packets if it wants to */
1160 ackinfo
.rxMTU
= htonl(rxrpc_rx_mtu
);
1161 ackinfo
.jumbo_max
= htonl(rxrpc_rx_jumbo_max
);
1163 serial
= atomic_inc_return(&call
->conn
->serial
);
1164 whdr
.serial
= htonl(serial
);
1165 _proto("Tx ACK %%%u { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
1168 ntohl(ack
.firstPacket
),
1169 ntohl(ack
.previousPacket
),
1171 rxrpc_acks(ack
.reason
),
1174 del_timer_sync(&call
->ack_timer
);
1176 set_bit(RXRPC_CALL_TX_SOFT_ACK
, &call
->flags
);
1177 goto send_message_2
;
1180 _debug("send message");
1182 serial
= atomic_inc_return(&call
->conn
->serial
);
1183 whdr
.serial
= htonl(serial
);
1184 _proto("Tx %s %%%u", rxrpc_pkts
[whdr
.type
], serial
);
1187 len
= iov
[0].iov_len
;
1189 if (iov
[4].iov_len
) {
1191 len
+= iov
[4].iov_len
;
1192 len
+= iov
[3].iov_len
;
1193 len
+= iov
[2].iov_len
;
1194 len
+= iov
[1].iov_len
;
1195 } else if (iov
[3].iov_len
) {
1197 len
+= iov
[3].iov_len
;
1198 len
+= iov
[2].iov_len
;
1199 len
+= iov
[1].iov_len
;
1200 } else if (iov
[2].iov_len
) {
1202 len
+= iov
[2].iov_len
;
1203 len
+= iov
[1].iov_len
;
1204 } else if (iov
[1].iov_len
) {
1206 len
+= iov
[1].iov_len
;
1209 ret
= kernel_sendmsg(call
->conn
->params
.local
->socket
,
1210 &msg
, iov
, ioc
, len
);
1212 _debug("sendmsg failed: %d", ret
);
1213 read_lock_bh(&call
->state_lock
);
1214 if (call
->state
< RXRPC_CALL_DEAD
)
1215 rxrpc_queue_call(call
);
1216 read_unlock_bh(&call
->state_lock
);
1221 case RXRPC_CALL_EV_ABORT
:
1222 clear_bit(genbit
, &call
->events
);
1223 clear_bit(RXRPC_CALL_EV_RCVD_ABORT
, &call
->events
);
1226 case RXRPC_CALL_EV_ACK_FINAL
:
1227 write_lock_bh(&call
->state_lock
);
1228 if (call
->state
== RXRPC_CALL_CLIENT_FINAL_ACK
)
1229 call
->state
= RXRPC_CALL_COMPLETE
;
1230 write_unlock_bh(&call
->state_lock
);
1234 clear_bit(genbit
, &call
->events
);
1235 switch (call
->state
) {
1236 case RXRPC_CALL_CLIENT_AWAIT_REPLY
:
1237 case RXRPC_CALL_CLIENT_RECV_REPLY
:
1238 case RXRPC_CALL_SERVER_RECV_REQUEST
:
1239 case RXRPC_CALL_SERVER_ACK_REQUEST
:
1240 _debug("start ACK timer");
1241 rxrpc_propose_ACK(call
, RXRPC_ACK_DELAY
,
1242 call
->ackr_serial
, false);
1246 goto maybe_reschedule
;
1250 del_timer_sync(&call
->ack_timer
);
1251 if (test_and_clear_bit(RXRPC_CALL_EV_ACK_FINAL
, &call
->events
))
1252 rxrpc_put_call(call
);
1253 clear_bit(RXRPC_CALL_EV_ACK
, &call
->events
);
1256 if (call
->events
|| !skb_queue_empty(&call
->rx_queue
)) {
1257 read_lock_bh(&call
->state_lock
);
1258 if (call
->state
< RXRPC_CALL_DEAD
)
1259 rxrpc_queue_call(call
);
1260 read_unlock_bh(&call
->state_lock
);
1263 /* don't leave aborted connections on the accept queue */
1264 if (call
->state
>= RXRPC_CALL_COMPLETE
&&
1265 !list_empty(&call
->accept_link
)) {
1266 _debug("X unlinking once-pending call %p { e=%lx f=%lx c=%x }",
1267 call
, call
->events
, call
->flags
, call
->conn
->proto
.cid
);
1269 read_lock_bh(&call
->state_lock
);
1270 if (!test_bit(RXRPC_CALL_RELEASED
, &call
->flags
) &&
1271 !test_and_set_bit(RXRPC_CALL_EV_RELEASE
, &call
->events
))
1272 rxrpc_queue_call(call
);
1273 read_unlock_bh(&call
->state_lock
);
1277 clear_bit(RXRPC_CALL_PROC_BUSY
, &call
->flags
);
1280 /* because we don't want two CPUs both processing the work item for one
1281 * call at the same time, we use a flag to note when it's busy; however
1282 * this means there's a race between clearing the flag and setting the
1283 * work pending bit and the work item being processed again */
1284 if (call
->events
&& !work_pending(&call
->processor
)) {
1285 _debug("jumpstart %x", call
->conn
->proto
.cid
);
1286 rxrpc_queue_call(call
);
1293 _debug("out of memory");
1294 goto maybe_reschedule
;