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-rw-r--r--net/rxrpc/Makefile27
-rw-r--r--net/rxrpc/call.c2277
-rw-r--r--net/rxrpc/connection.c777
-rw-r--r--net/rxrpc/internal.h106
-rw-r--r--net/rxrpc/krxiod.c262
-rw-r--r--net/rxrpc/krxsecd.c270
-rw-r--r--net/rxrpc/krxtimod.c204
-rw-r--r--net/rxrpc/main.c180
-rw-r--r--net/rxrpc/peer.c398
-rw-r--r--net/rxrpc/proc.c617
-rw-r--r--net/rxrpc/rxrpc_syms.c34
-rw-r--r--net/rxrpc/sysctl.c121
-rw-r--r--net/rxrpc/transport.c846
13 files changed, 1 insertions, 6118 deletions
diff --git a/net/rxrpc/Makefile b/net/rxrpc/Makefile
index 07bf82ffec6a..c46867c61c98 100644
--- a/net/rxrpc/Makefile
+++ b/net/rxrpc/Makefile
@@ -1,9 +1,7 @@
1# 1#
2# Makefile for Linux kernel Rx RPC 2# Makefile for Linux kernel RxRPC
3# 3#
4 4
5#CFLAGS += -finstrument-functions
6
7af-rxrpc-objs := \ 5af-rxrpc-objs := \
8 af_rxrpc.o \ 6 af_rxrpc.o \
9 ar-accept.o \ 7 ar-accept.o \
@@ -29,26 +27,3 @@ endif
29obj-$(CONFIG_AF_RXRPC) += af-rxrpc.o 27obj-$(CONFIG_AF_RXRPC) += af-rxrpc.o
30 28
31obj-$(CONFIG_RXKAD) += rxkad.o 29obj-$(CONFIG_RXKAD) += rxkad.o
32
33#
34# obsolete RxRPC interface, still used by fs/afs/
35#
36rxrpc-objs := \
37 call.o \
38 connection.o \
39 krxiod.o \
40 krxsecd.o \
41 krxtimod.o \
42 main.o \
43 peer.o \
44 rxrpc_syms.o \
45 transport.o
46
47ifeq ($(CONFIG_PROC_FS),y)
48rxrpc-objs += proc.o
49endif
50ifeq ($(CONFIG_SYSCTL),y)
51rxrpc-objs += sysctl.o
52endif
53
54obj-$(CONFIG_RXRPC) += rxrpc.o
diff --git a/net/rxrpc/call.c b/net/rxrpc/call.c
deleted file mode 100644
index d07122b57e0d..000000000000
--- a/net/rxrpc/call.c
+++ /dev/null
@@ -1,2277 +0,0 @@
1/* call.c: Rx call routines
2 *
3 * Copyright (C) 2002 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/sched.h>
13#include <linux/slab.h>
14#include <linux/module.h>
15#include <rxrpc/rxrpc.h>
16#include <rxrpc/transport.h>
17#include <rxrpc/peer.h>
18#include <rxrpc/connection.h>
19#include <rxrpc/call.h>
20#include <rxrpc/message.h>
21#include "internal.h"
22
23__RXACCT_DECL(atomic_t rxrpc_call_count);
24__RXACCT_DECL(atomic_t rxrpc_message_count);
25
26LIST_HEAD(rxrpc_calls);
27DECLARE_RWSEM(rxrpc_calls_sem);
28
29unsigned rxrpc_call_rcv_timeout = HZ/3;
30static unsigned rxrpc_call_acks_timeout = HZ/3;
31static unsigned rxrpc_call_dfr_ack_timeout = HZ/20;
32static unsigned short rxrpc_call_max_resend = HZ/10;
33
34const char *rxrpc_call_states[] = {
35 "COMPLETE",
36 "ERROR",
37 "SRVR_RCV_OPID",
38 "SRVR_RCV_ARGS",
39 "SRVR_GOT_ARGS",
40 "SRVR_SND_REPLY",
41 "SRVR_RCV_FINAL_ACK",
42 "CLNT_SND_ARGS",
43 "CLNT_RCV_REPLY",
44 "CLNT_GOT_REPLY"
45};
46
47const char *rxrpc_call_error_states[] = {
48 "NO_ERROR",
49 "LOCAL_ABORT",
50 "PEER_ABORT",
51 "LOCAL_ERROR",
52 "REMOTE_ERROR"
53};
54
55const char *rxrpc_pkts[] = {
56 "?00",
57 "data", "ack", "busy", "abort", "ackall", "chall", "resp", "debug",
58 "?09", "?10", "?11", "?12", "?13", "?14", "?15"
59};
60
61static const char *rxrpc_acks[] = {
62 "---", "REQ", "DUP", "SEQ", "WIN", "MEM", "PNG", "PNR", "DLY", "IDL",
63 "-?-"
64};
65
66static const char _acktype[] = "NA-";
67
68static void rxrpc_call_receive_packet(struct rxrpc_call *call);
69static void rxrpc_call_receive_data_packet(struct rxrpc_call *call,
70 struct rxrpc_message *msg);
71static void rxrpc_call_receive_ack_packet(struct rxrpc_call *call,
72 struct rxrpc_message *msg);
73static void rxrpc_call_definitively_ACK(struct rxrpc_call *call,
74 rxrpc_seq_t higest);
75static void rxrpc_call_resend(struct rxrpc_call *call, rxrpc_seq_t highest);
76static int __rxrpc_call_read_data(struct rxrpc_call *call);
77
78static int rxrpc_call_record_ACK(struct rxrpc_call *call,
79 struct rxrpc_message *msg,
80 rxrpc_seq_t seq,
81 size_t count);
82
83static int rxrpc_call_flush(struct rxrpc_call *call);
84
85#define _state(call) \
86 _debug("[[[ state %s ]]]", rxrpc_call_states[call->app_call_state]);
87
88static void rxrpc_call_default_attn_func(struct rxrpc_call *call)
89{
90 wake_up(&call->waitq);
91}
92
93static void rxrpc_call_default_error_func(struct rxrpc_call *call)
94{
95 wake_up(&call->waitq);
96}
97
98static void rxrpc_call_default_aemap_func(struct rxrpc_call *call)
99{
100 switch (call->app_err_state) {
101 case RXRPC_ESTATE_LOCAL_ABORT:
102 call->app_abort_code = -call->app_errno;
103 case RXRPC_ESTATE_PEER_ABORT:
104 call->app_errno = -ECONNABORTED;
105 default:
106 break;
107 }
108}
109
110static void __rxrpc_call_acks_timeout(unsigned long _call)
111{
112 struct rxrpc_call *call = (struct rxrpc_call *) _call;
113
114 _debug("ACKS TIMEOUT %05lu", jiffies - call->cjif);
115
116 call->flags |= RXRPC_CALL_ACKS_TIMO;
117 rxrpc_krxiod_queue_call(call);
118}
119
120static void __rxrpc_call_rcv_timeout(unsigned long _call)
121{
122 struct rxrpc_call *call = (struct rxrpc_call *) _call;
123
124 _debug("RCV TIMEOUT %05lu", jiffies - call->cjif);
125
126 call->flags |= RXRPC_CALL_RCV_TIMO;
127 rxrpc_krxiod_queue_call(call);
128}
129
130static void __rxrpc_call_ackr_timeout(unsigned long _call)
131{
132 struct rxrpc_call *call = (struct rxrpc_call *) _call;
133
134 _debug("ACKR TIMEOUT %05lu",jiffies - call->cjif);
135
136 call->flags |= RXRPC_CALL_ACKR_TIMO;
137 rxrpc_krxiod_queue_call(call);
138}
139
140/*****************************************************************************/
141/*
142 * calculate a timeout based on an RTT value
143 */
144static inline unsigned long __rxrpc_rtt_based_timeout(struct rxrpc_call *call,
145 unsigned long val)
146{
147 unsigned long expiry = call->conn->peer->rtt / (1000000 / HZ);
148
149 expiry += 10;
150 if (expiry < HZ / 25)
151 expiry = HZ / 25;
152 if (expiry > HZ)
153 expiry = HZ;
154
155 _leave(" = %lu jiffies", expiry);
156 return jiffies + expiry;
157} /* end __rxrpc_rtt_based_timeout() */
158
159/*****************************************************************************/
160/*
161 * create a new call record
162 */
163static inline int __rxrpc_create_call(struct rxrpc_connection *conn,
164 struct rxrpc_call **_call)
165{
166 struct rxrpc_call *call;
167
168 _enter("%p", conn);
169
170 /* allocate and initialise a call record */
171 call = (struct rxrpc_call *) get_zeroed_page(GFP_KERNEL);
172 if (!call) {
173 _leave(" ENOMEM");
174 return -ENOMEM;
175 }
176
177 atomic_set(&call->usage, 1);
178
179 init_waitqueue_head(&call->waitq);
180 spin_lock_init(&call->lock);
181 INIT_LIST_HEAD(&call->link);
182 INIT_LIST_HEAD(&call->acks_pendq);
183 INIT_LIST_HEAD(&call->rcv_receiveq);
184 INIT_LIST_HEAD(&call->rcv_krxiodq_lk);
185 INIT_LIST_HEAD(&call->app_readyq);
186 INIT_LIST_HEAD(&call->app_unreadyq);
187 INIT_LIST_HEAD(&call->app_link);
188 INIT_LIST_HEAD(&call->app_attn_link);
189
190 init_timer(&call->acks_timeout);
191 call->acks_timeout.data = (unsigned long) call;
192 call->acks_timeout.function = __rxrpc_call_acks_timeout;
193
194 init_timer(&call->rcv_timeout);
195 call->rcv_timeout.data = (unsigned long) call;
196 call->rcv_timeout.function = __rxrpc_call_rcv_timeout;
197
198 init_timer(&call->ackr_dfr_timo);
199 call->ackr_dfr_timo.data = (unsigned long) call;
200 call->ackr_dfr_timo.function = __rxrpc_call_ackr_timeout;
201
202 call->conn = conn;
203 call->ackr_win_bot = 1;
204 call->ackr_win_top = call->ackr_win_bot + RXRPC_CALL_ACK_WINDOW_SIZE - 1;
205 call->ackr_prev_seq = 0;
206 call->app_mark = RXRPC_APP_MARK_EOF;
207 call->app_attn_func = rxrpc_call_default_attn_func;
208 call->app_error_func = rxrpc_call_default_error_func;
209 call->app_aemap_func = rxrpc_call_default_aemap_func;
210 call->app_scr_alloc = call->app_scratch;
211
212 call->cjif = jiffies;
213
214 _leave(" = 0 (%p)", call);
215
216 *_call = call;
217
218 return 0;
219} /* end __rxrpc_create_call() */
220
221/*****************************************************************************/
222/*
223 * create a new call record for outgoing calls
224 */
225int rxrpc_create_call(struct rxrpc_connection *conn,
226 rxrpc_call_attn_func_t attn,
227 rxrpc_call_error_func_t error,
228 rxrpc_call_aemap_func_t aemap,
229 struct rxrpc_call **_call)
230{
231 DECLARE_WAITQUEUE(myself, current);
232
233 struct rxrpc_call *call;
234 int ret, cix, loop;
235
236 _enter("%p", conn);
237
238 /* allocate and initialise a call record */
239 ret = __rxrpc_create_call(conn, &call);
240 if (ret < 0) {
241 _leave(" = %d", ret);
242 return ret;
243 }
244
245 call->app_call_state = RXRPC_CSTATE_CLNT_SND_ARGS;
246 if (attn)
247 call->app_attn_func = attn;
248 if (error)
249 call->app_error_func = error;
250 if (aemap)
251 call->app_aemap_func = aemap;
252
253 _state(call);
254
255 spin_lock(&conn->lock);
256 set_current_state(TASK_INTERRUPTIBLE);
257 add_wait_queue(&conn->chanwait, &myself);
258
259 try_again:
260 /* try to find an unused channel */
261 for (cix = 0; cix < 4; cix++)
262 if (!conn->channels[cix])
263 goto obtained_chan;
264
265 /* no free channels - wait for one to become available */
266 ret = -EINTR;
267 if (signal_pending(current))
268 goto error_unwait;
269
270 spin_unlock(&conn->lock);
271
272 schedule();
273 set_current_state(TASK_INTERRUPTIBLE);
274
275 spin_lock(&conn->lock);
276 goto try_again;
277
278 /* got a channel - now attach to the connection */
279 obtained_chan:
280 remove_wait_queue(&conn->chanwait, &myself);
281 set_current_state(TASK_RUNNING);
282
283 /* concoct a unique call number */
284 next_callid:
285 call->call_id = htonl(++conn->call_counter);
286 for (loop = 0; loop < 4; loop++)
287 if (conn->channels[loop] &&
288 conn->channels[loop]->call_id == call->call_id)
289 goto next_callid;
290
291 rxrpc_get_connection(conn);
292 conn->channels[cix] = call; /* assign _after_ done callid check loop */
293 do_gettimeofday(&conn->atime);
294 call->chan_ix = htonl(cix);
295
296 spin_unlock(&conn->lock);
297
298 down_write(&rxrpc_calls_sem);
299 list_add_tail(&call->call_link, &rxrpc_calls);
300 up_write(&rxrpc_calls_sem);
301
302 __RXACCT(atomic_inc(&rxrpc_call_count));
303 *_call = call;
304
305 _leave(" = 0 (call=%p cix=%u)", call, cix);
306 return 0;
307
308 error_unwait:
309 remove_wait_queue(&conn->chanwait, &myself);
310 set_current_state(TASK_RUNNING);
311 spin_unlock(&conn->lock);
312
313 free_page((unsigned long) call);
314 _leave(" = %d", ret);
315 return ret;
316} /* end rxrpc_create_call() */
317
318/*****************************************************************************/
319/*
320 * create a new call record for incoming calls
321 */
322int rxrpc_incoming_call(struct rxrpc_connection *conn,
323 struct rxrpc_message *msg,
324 struct rxrpc_call **_call)
325{
326 struct rxrpc_call *call;
327 unsigned cix;
328 int ret;
329
330 cix = ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK;
331
332 _enter("%p,%u,%u", conn, ntohl(msg->hdr.callNumber), cix);
333
334 /* allocate and initialise a call record */
335 ret = __rxrpc_create_call(conn, &call);
336 if (ret < 0) {
337 _leave(" = %d", ret);
338 return ret;
339 }
340
341 call->pkt_rcv_count = 1;
342 call->app_call_state = RXRPC_CSTATE_SRVR_RCV_OPID;
343 call->app_mark = sizeof(uint32_t);
344
345 _state(call);
346
347 /* attach to the connection */
348 ret = -EBUSY;
349 call->chan_ix = htonl(cix);
350 call->call_id = msg->hdr.callNumber;
351
352 spin_lock(&conn->lock);
353
354 if (!conn->channels[cix] ||
355 conn->channels[cix]->app_call_state == RXRPC_CSTATE_COMPLETE ||
356 conn->channels[cix]->app_call_state == RXRPC_CSTATE_ERROR
357 ) {
358 conn->channels[cix] = call;
359 rxrpc_get_connection(conn);
360 ret = 0;
361 }
362
363 spin_unlock(&conn->lock);
364
365 if (ret < 0) {
366 free_page((unsigned long) call);
367 call = NULL;
368 }
369
370 if (ret == 0) {
371 down_write(&rxrpc_calls_sem);
372 list_add_tail(&call->call_link, &rxrpc_calls);
373 up_write(&rxrpc_calls_sem);
374 __RXACCT(atomic_inc(&rxrpc_call_count));
375 *_call = call;
376 }
377
378 _leave(" = %d [%p]", ret, call);
379 return ret;
380} /* end rxrpc_incoming_call() */
381
382/*****************************************************************************/
383/*
384 * free a call record
385 */
386void rxrpc_put_call(struct rxrpc_call *call)
387{
388 struct rxrpc_connection *conn = call->conn;
389 struct rxrpc_message *msg;
390
391 _enter("%p{u=%d}",call,atomic_read(&call->usage));
392
393 /* sanity check */
394 if (atomic_read(&call->usage) <= 0)
395 BUG();
396
397 /* to prevent a race, the decrement and the de-list must be effectively
398 * atomic */
399 spin_lock(&conn->lock);
400 if (likely(!atomic_dec_and_test(&call->usage))) {
401 spin_unlock(&conn->lock);
402 _leave("");
403 return;
404 }
405
406 if (conn->channels[ntohl(call->chan_ix)] == call)
407 conn->channels[ntohl(call->chan_ix)] = NULL;
408
409 spin_unlock(&conn->lock);
410
411 wake_up(&conn->chanwait);
412
413 rxrpc_put_connection(conn);
414
415 /* clear the timers and dequeue from krxiod */
416 del_timer_sync(&call->acks_timeout);
417 del_timer_sync(&call->rcv_timeout);
418 del_timer_sync(&call->ackr_dfr_timo);
419
420 rxrpc_krxiod_dequeue_call(call);
421
422 /* clean up the contents of the struct */
423 if (call->snd_nextmsg)
424 rxrpc_put_message(call->snd_nextmsg);
425
426 if (call->snd_ping)
427 rxrpc_put_message(call->snd_ping);
428
429 while (!list_empty(&call->acks_pendq)) {
430 msg = list_entry(call->acks_pendq.next,
431 struct rxrpc_message, link);
432 list_del(&msg->link);
433 rxrpc_put_message(msg);
434 }
435
436 while (!list_empty(&call->rcv_receiveq)) {
437 msg = list_entry(call->rcv_receiveq.next,
438 struct rxrpc_message, link);
439 list_del(&msg->link);
440 rxrpc_put_message(msg);
441 }
442
443 while (!list_empty(&call->app_readyq)) {
444 msg = list_entry(call->app_readyq.next,
445 struct rxrpc_message, link);
446 list_del(&msg->link);
447 rxrpc_put_message(msg);
448 }
449
450 while (!list_empty(&call->app_unreadyq)) {
451 msg = list_entry(call->app_unreadyq.next,
452 struct rxrpc_message, link);
453 list_del(&msg->link);
454 rxrpc_put_message(msg);
455 }
456
457 module_put(call->owner);
458
459 down_write(&rxrpc_calls_sem);
460 list_del(&call->call_link);
461 up_write(&rxrpc_calls_sem);
462
463 __RXACCT(atomic_dec(&rxrpc_call_count));
464 free_page((unsigned long) call);
465
466 _leave(" [destroyed]");
467} /* end rxrpc_put_call() */
468
469/*****************************************************************************/
470/*
471 * actually generate a normal ACK
472 */
473static inline int __rxrpc_call_gen_normal_ACK(struct rxrpc_call *call,
474 rxrpc_seq_t seq)
475{
476 struct rxrpc_message *msg;
477 struct kvec diov[3];
478 __be32 aux[4];
479 int delta, ret;
480
481 /* ACKs default to DELAY */
482 if (!call->ackr.reason)
483 call->ackr.reason = RXRPC_ACK_DELAY;
484
485 _proto("Rx %05lu Sending ACK { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
486 jiffies - call->cjif,
487 ntohs(call->ackr.maxSkew),
488 ntohl(call->ackr.firstPacket),
489 ntohl(call->ackr.previousPacket),
490 ntohl(call->ackr.serial),
491 rxrpc_acks[call->ackr.reason],
492 call->ackr.nAcks);
493
494 aux[0] = htonl(call->conn->peer->if_mtu); /* interface MTU */
495 aux[1] = htonl(1444); /* max MTU */
496 aux[2] = htonl(16); /* rwind */
497 aux[3] = htonl(4); /* max packets */
498
499 diov[0].iov_len = sizeof(struct rxrpc_ackpacket);
500 diov[0].iov_base = &call->ackr;
501 diov[1].iov_len = call->ackr_pend_cnt + 3;
502 diov[1].iov_base = call->ackr_array;
503 diov[2].iov_len = sizeof(aux);
504 diov[2].iov_base = &aux;
505
506 /* build and send the message */
507 ret = rxrpc_conn_newmsg(call->conn,call, RXRPC_PACKET_TYPE_ACK,
508 3, diov, GFP_KERNEL, &msg);
509 if (ret < 0)
510 goto out;
511
512 msg->seq = seq;
513 msg->hdr.seq = htonl(seq);
514 msg->hdr.flags |= RXRPC_SLOW_START_OK;
515
516 ret = rxrpc_conn_sendmsg(call->conn, msg);
517 rxrpc_put_message(msg);
518 if (ret < 0)
519 goto out;
520 call->pkt_snd_count++;
521
522 /* count how many actual ACKs there were at the front */
523 for (delta = 0; delta < call->ackr_pend_cnt; delta++)
524 if (call->ackr_array[delta] != RXRPC_ACK_TYPE_ACK)
525 break;
526
527 call->ackr_pend_cnt -= delta; /* all ACK'd to this point */
528
529 /* crank the ACK window around */
530 if (delta == 0) {
531 /* un-ACK'd window */
532 }
533 else if (delta < RXRPC_CALL_ACK_WINDOW_SIZE) {
534 /* partially ACK'd window
535 * - shuffle down to avoid losing out-of-sequence packets
536 */
537 call->ackr_win_bot += delta;
538 call->ackr_win_top += delta;
539
540 memmove(&call->ackr_array[0],
541 &call->ackr_array[delta],
542 call->ackr_pend_cnt);
543
544 memset(&call->ackr_array[call->ackr_pend_cnt],
545 RXRPC_ACK_TYPE_NACK,
546 sizeof(call->ackr_array) - call->ackr_pend_cnt);
547 }
548 else {
549 /* fully ACK'd window
550 * - just clear the whole thing
551 */
552 memset(&call->ackr_array,
553 RXRPC_ACK_TYPE_NACK,
554 sizeof(call->ackr_array));
555 }
556
557 /* clear this ACK */
558 memset(&call->ackr, 0, sizeof(call->ackr));
559
560 out:
561 if (!call->app_call_state)
562 printk("___ STATE 0 ___\n");
563 return ret;
564} /* end __rxrpc_call_gen_normal_ACK() */
565
566/*****************************************************************************/
567/*
568 * note the reception of a packet in the call's ACK records and generate an
569 * appropriate ACK packet if necessary
570 * - returns 0 if packet should be processed, 1 if packet should be ignored
571 * and -ve on an error
572 */
573static int rxrpc_call_generate_ACK(struct rxrpc_call *call,
574 struct rxrpc_header *hdr,
575 struct rxrpc_ackpacket *ack)
576{
577 struct rxrpc_message *msg;
578 rxrpc_seq_t seq;
579 unsigned offset;
580 int ret = 0, err;
581 u8 special_ACK, do_ACK, force;
582
583 _enter("%p,%p { seq=%d tp=%d fl=%02x }",
584 call, hdr, ntohl(hdr->seq), hdr->type, hdr->flags);
585
586 seq = ntohl(hdr->seq);
587 offset = seq - call->ackr_win_bot;
588 do_ACK = RXRPC_ACK_DELAY;
589 special_ACK = 0;
590 force = (seq == 1);
591
592 if (call->ackr_high_seq < seq)
593 call->ackr_high_seq = seq;
594
595 /* deal with generation of obvious special ACKs first */
596 if (ack && ack->reason == RXRPC_ACK_PING) {
597 special_ACK = RXRPC_ACK_PING_RESPONSE;
598 ret = 1;
599 goto gen_ACK;
600 }
601
602 if (seq < call->ackr_win_bot) {
603 special_ACK = RXRPC_ACK_DUPLICATE;
604 ret = 1;
605 goto gen_ACK;
606 }
607
608 if (seq >= call->ackr_win_top) {
609 special_ACK = RXRPC_ACK_EXCEEDS_WINDOW;
610 ret = 1;
611 goto gen_ACK;
612 }
613
614 if (call->ackr_array[offset] != RXRPC_ACK_TYPE_NACK) {
615 special_ACK = RXRPC_ACK_DUPLICATE;
616 ret = 1;
617 goto gen_ACK;
618 }
619
620 /* okay... it's a normal data packet inside the ACK window */
621 call->ackr_array[offset] = RXRPC_ACK_TYPE_ACK;
622
623 if (offset < call->ackr_pend_cnt) {
624 }
625 else if (offset > call->ackr_pend_cnt) {
626 do_ACK = RXRPC_ACK_OUT_OF_SEQUENCE;
627 call->ackr_pend_cnt = offset;
628 goto gen_ACK;
629 }
630
631 if (hdr->flags & RXRPC_REQUEST_ACK) {
632 do_ACK = RXRPC_ACK_REQUESTED;
633 }
634
635 /* generate an ACK on the final packet of a reply just received */
636 if (hdr->flags & RXRPC_LAST_PACKET) {
637 if (call->conn->out_clientflag)
638 force = 1;
639 }
640 else if (!(hdr->flags & RXRPC_MORE_PACKETS)) {
641 do_ACK = RXRPC_ACK_REQUESTED;
642 }
643
644 /* re-ACK packets previously received out-of-order */
645 for (offset++; offset < RXRPC_CALL_ACK_WINDOW_SIZE; offset++)
646 if (call->ackr_array[offset] != RXRPC_ACK_TYPE_ACK)
647 break;
648
649 call->ackr_pend_cnt = offset;
650
651 /* generate an ACK if we fill up the window */
652 if (call->ackr_pend_cnt >= RXRPC_CALL_ACK_WINDOW_SIZE)
653 force = 1;
654
655 gen_ACK:
656 _debug("%05lu ACKs pend=%u norm=%s special=%s%s",
657 jiffies - call->cjif,
658 call->ackr_pend_cnt,
659 rxrpc_acks[do_ACK],
660 rxrpc_acks[special_ACK],
661 force ? " immediate" :
662 do_ACK == RXRPC_ACK_REQUESTED ? " merge-req" :
663 hdr->flags & RXRPC_LAST_PACKET ? " finalise" :
664 " defer"
665 );
666
667 /* send any pending normal ACKs if need be */
668 if (call->ackr_pend_cnt > 0) {
669 /* fill out the appropriate form */
670 call->ackr.bufferSpace = htons(RXRPC_CALL_ACK_WINDOW_SIZE);
671 call->ackr.maxSkew = htons(min(call->ackr_high_seq - seq,
672 65535U));
673 call->ackr.firstPacket = htonl(call->ackr_win_bot);
674 call->ackr.previousPacket = call->ackr_prev_seq;
675 call->ackr.serial = hdr->serial;
676 call->ackr.nAcks = call->ackr_pend_cnt;
677
678 if (do_ACK == RXRPC_ACK_REQUESTED)
679 call->ackr.reason = do_ACK;
680
681 /* generate the ACK immediately if necessary */
682 if (special_ACK || force) {
683 err = __rxrpc_call_gen_normal_ACK(
684 call, do_ACK == RXRPC_ACK_DELAY ? 0 : seq);
685 if (err < 0) {
686 ret = err;
687 goto out;
688 }
689 }
690 }
691
692 if (call->ackr.reason == RXRPC_ACK_REQUESTED)
693 call->ackr_dfr_seq = seq;
694
695 /* start the ACK timer if not running if there are any pending deferred
696 * ACKs */
697 if (call->ackr_pend_cnt > 0 &&
698 call->ackr.reason != RXRPC_ACK_REQUESTED &&
699 !timer_pending(&call->ackr_dfr_timo)
700 ) {
701 unsigned long timo;
702
703 timo = rxrpc_call_dfr_ack_timeout + jiffies;
704
705 _debug("START ACKR TIMER for cj=%lu", timo - call->cjif);
706
707 spin_lock(&call->lock);
708 mod_timer(&call->ackr_dfr_timo, timo);
709 spin_unlock(&call->lock);
710 }
711 else if ((call->ackr_pend_cnt == 0 ||
712 call->ackr.reason == RXRPC_ACK_REQUESTED) &&
713 timer_pending(&call->ackr_dfr_timo)
714 ) {
715 /* stop timer if no pending ACKs */
716 _debug("CLEAR ACKR TIMER");
717 del_timer_sync(&call->ackr_dfr_timo);
718 }
719
720 /* send a special ACK if one is required */
721 if (special_ACK) {
722 struct rxrpc_ackpacket ack;
723 struct kvec diov[2];
724 uint8_t acks[1] = { RXRPC_ACK_TYPE_ACK };
725
726 /* fill out the appropriate form */
727 ack.bufferSpace = htons(RXRPC_CALL_ACK_WINDOW_SIZE);
728 ack.maxSkew = htons(min(call->ackr_high_seq - seq,
729 65535U));
730 ack.firstPacket = htonl(call->ackr_win_bot);
731 ack.previousPacket = call->ackr_prev_seq;
732 ack.serial = hdr->serial;
733 ack.reason = special_ACK;
734 ack.nAcks = 0;
735
736 _proto("Rx Sending s-ACK"
737 " { m=%hu f=#%u p=#%u s=%%%u r=%s n=%u }",
738 ntohs(ack.maxSkew),
739 ntohl(ack.firstPacket),
740 ntohl(ack.previousPacket),
741 ntohl(ack.serial),
742 rxrpc_acks[ack.reason],
743 ack.nAcks);
744
745 diov[0].iov_len = sizeof(struct rxrpc_ackpacket);
746 diov[0].iov_base = &ack;
747 diov[1].iov_len = sizeof(acks);
748 diov[1].iov_base = acks;
749
750 /* build and send the message */
751 err = rxrpc_conn_newmsg(call->conn,call, RXRPC_PACKET_TYPE_ACK,
752 hdr->seq ? 2 : 1, diov,
753 GFP_KERNEL,
754 &msg);
755 if (err < 0) {
756 ret = err;
757 goto out;
758 }
759
760 msg->seq = seq;
761 msg->hdr.seq = htonl(seq);
762 msg->hdr.flags |= RXRPC_SLOW_START_OK;
763
764 err = rxrpc_conn_sendmsg(call->conn, msg);
765 rxrpc_put_message(msg);
766 if (err < 0) {
767 ret = err;
768 goto out;
769 }
770 call->pkt_snd_count++;
771 }
772
773 out:
774 if (hdr->seq)
775 call->ackr_prev_seq = hdr->seq;
776
777 _leave(" = %d", ret);
778 return ret;
779} /* end rxrpc_call_generate_ACK() */
780
781/*****************************************************************************/
782/*
783 * handle work to be done on a call
784 * - includes packet reception and timeout processing
785 */
786void rxrpc_call_do_stuff(struct rxrpc_call *call)
787{
788 _enter("%p{flags=%lx}", call, call->flags);
789
790 /* handle packet reception */
791 if (call->flags & RXRPC_CALL_RCV_PKT) {
792 _debug("- receive packet");
793 call->flags &= ~RXRPC_CALL_RCV_PKT;
794 rxrpc_call_receive_packet(call);
795 }
796
797 /* handle overdue ACKs */
798 if (call->flags & RXRPC_CALL_ACKS_TIMO) {
799 _debug("- overdue ACK timeout");
800 call->flags &= ~RXRPC_CALL_ACKS_TIMO;
801 rxrpc_call_resend(call, call->snd_seq_count);
802 }
803
804 /* handle lack of reception */
805 if (call->flags & RXRPC_CALL_RCV_TIMO) {
806 _debug("- reception timeout");
807 call->flags &= ~RXRPC_CALL_RCV_TIMO;
808 rxrpc_call_abort(call, -EIO);
809 }
810
811 /* handle deferred ACKs */
812 if (call->flags & RXRPC_CALL_ACKR_TIMO ||
813 (call->ackr.nAcks > 0 && call->ackr.reason == RXRPC_ACK_REQUESTED)
814 ) {
815 _debug("- deferred ACK timeout: cj=%05lu r=%s n=%u",
816 jiffies - call->cjif,
817 rxrpc_acks[call->ackr.reason],
818 call->ackr.nAcks);
819
820 call->flags &= ~RXRPC_CALL_ACKR_TIMO;
821
822 if (call->ackr.nAcks > 0 &&
823 call->app_call_state != RXRPC_CSTATE_ERROR) {
824 /* generate ACK */
825 __rxrpc_call_gen_normal_ACK(call, call->ackr_dfr_seq);
826 call->ackr_dfr_seq = 0;
827 }
828 }
829
830 _leave("");
831
832} /* end rxrpc_call_do_stuff() */
833
834/*****************************************************************************/
835/*
836 * send an abort message at call or connection level
837 * - must be called with call->lock held
838 * - the supplied error code is sent as the packet data
839 */
840static int __rxrpc_call_abort(struct rxrpc_call *call, int errno)
841{
842 struct rxrpc_connection *conn = call->conn;
843 struct rxrpc_message *msg;
844 struct kvec diov[1];
845 int ret;
846 __be32 _error;
847
848 _enter("%p{%08x},%p{%d},%d",
849 conn, ntohl(conn->conn_id), call, ntohl(call->call_id), errno);
850
851 /* if this call is already aborted, then just wake up any waiters */
852 if (call->app_call_state == RXRPC_CSTATE_ERROR) {
853 spin_unlock(&call->lock);
854 call->app_error_func(call);
855 _leave(" = 0");
856 return 0;
857 }
858
859 rxrpc_get_call(call);
860
861 /* change the state _with_ the lock still held */
862 call->app_call_state = RXRPC_CSTATE_ERROR;
863 call->app_err_state = RXRPC_ESTATE_LOCAL_ABORT;
864 call->app_errno = errno;
865 call->app_mark = RXRPC_APP_MARK_EOF;
866 call->app_read_buf = NULL;
867 call->app_async_read = 0;
868
869 _state(call);
870
871 /* ask the app to translate the error code */
872 call->app_aemap_func(call);
873
874 spin_unlock(&call->lock);
875
876 /* flush any outstanding ACKs */
877 del_timer_sync(&call->acks_timeout);
878 del_timer_sync(&call->rcv_timeout);
879 del_timer_sync(&call->ackr_dfr_timo);
880
881 if (rxrpc_call_is_ack_pending(call))
882 __rxrpc_call_gen_normal_ACK(call, 0);
883
884 /* send the abort packet only if we actually traded some other
885 * packets */
886 ret = 0;
887 if (call->pkt_snd_count || call->pkt_rcv_count) {
888 /* actually send the abort */
889 _proto("Rx Sending Call ABORT { data=%d }",
890 call->app_abort_code);
891
892 _error = htonl(call->app_abort_code);
893
894 diov[0].iov_len = sizeof(_error);
895 diov[0].iov_base = &_error;
896
897 ret = rxrpc_conn_newmsg(conn, call, RXRPC_PACKET_TYPE_ABORT,
898 1, diov, GFP_KERNEL, &msg);
899 if (ret == 0) {
900 ret = rxrpc_conn_sendmsg(conn, msg);
901 rxrpc_put_message(msg);
902 }
903 }
904
905 /* tell the app layer to let go */
906 call->app_error_func(call);
907
908 rxrpc_put_call(call);
909
910 _leave(" = %d", ret);
911 return ret;
912} /* end __rxrpc_call_abort() */
913
914/*****************************************************************************/
915/*
916 * send an abort message at call or connection level
917 * - the supplied error code is sent as the packet data
918 */
919int rxrpc_call_abort(struct rxrpc_call *call, int error)
920{
921 spin_lock(&call->lock);
922
923 return __rxrpc_call_abort(call, error);
924
925} /* end rxrpc_call_abort() */
926
927/*****************************************************************************/
928/*
929 * process packets waiting for this call
930 */
931static void rxrpc_call_receive_packet(struct rxrpc_call *call)
932{
933 struct rxrpc_message *msg;
934 struct list_head *_p;
935
936 _enter("%p", call);
937
938 rxrpc_get_call(call); /* must not go away too soon if aborted by
939 * app-layer */
940
941 while (!list_empty(&call->rcv_receiveq)) {
942 /* try to get next packet */
943 _p = NULL;
944 spin_lock(&call->lock);
945 if (!list_empty(&call->rcv_receiveq)) {
946 _p = call->rcv_receiveq.next;
947 list_del_init(_p);
948 }
949 spin_unlock(&call->lock);
950
951 if (!_p)
952 break;
953
954 msg = list_entry(_p, struct rxrpc_message, link);
955
956 _proto("Rx %05lu Received %s packet (%%%u,#%u,%c%c%c%c%c)",
957 jiffies - call->cjif,
958 rxrpc_pkts[msg->hdr.type],
959 ntohl(msg->hdr.serial),
960 msg->seq,
961 msg->hdr.flags & RXRPC_JUMBO_PACKET ? 'j' : '-',
962 msg->hdr.flags & RXRPC_MORE_PACKETS ? 'm' : '-',
963 msg->hdr.flags & RXRPC_LAST_PACKET ? 'l' : '-',
964 msg->hdr.flags & RXRPC_REQUEST_ACK ? 'r' : '-',
965 msg->hdr.flags & RXRPC_CLIENT_INITIATED ? 'C' : 'S'
966 );
967
968 switch (msg->hdr.type) {
969 /* deal with data packets */
970 case RXRPC_PACKET_TYPE_DATA:
971 /* ACK the packet if necessary */
972 switch (rxrpc_call_generate_ACK(call, &msg->hdr,
973 NULL)) {
974 case 0: /* useful packet */
975 rxrpc_call_receive_data_packet(call, msg);
976 break;
977 case 1: /* duplicate or out-of-window packet */
978 break;
979 default:
980 rxrpc_put_message(msg);
981 goto out;
982 }
983 break;
984
985 /* deal with ACK packets */
986 case RXRPC_PACKET_TYPE_ACK:
987 rxrpc_call_receive_ack_packet(call, msg);
988 break;
989
990 /* deal with abort packets */
991 case RXRPC_PACKET_TYPE_ABORT: {
992 __be32 _dbuf, *dp;
993
994 dp = skb_header_pointer(msg->pkt, msg->offset,
995 sizeof(_dbuf), &_dbuf);
996 if (dp == NULL)
997 printk("Rx Received short ABORT packet\n");
998
999 _proto("Rx Received Call ABORT { data=%d }",
1000 (dp ? ntohl(*dp) : 0));
1001
1002 spin_lock(&call->lock);
1003 call->app_call_state = RXRPC_CSTATE_ERROR;
1004 call->app_err_state = RXRPC_ESTATE_PEER_ABORT;
1005 call->app_abort_code = (dp ? ntohl(*dp) : 0);
1006 call->app_errno = -ECONNABORTED;
1007 call->app_mark = RXRPC_APP_MARK_EOF;
1008 call->app_read_buf = NULL;
1009 call->app_async_read = 0;
1010
1011 /* ask the app to translate the error code */
1012 call->app_aemap_func(call);
1013 _state(call);
1014 spin_unlock(&call->lock);
1015 call->app_error_func(call);
1016 break;
1017 }
1018 default:
1019 /* deal with other packet types */
1020 _proto("Rx Unsupported packet type %u (#%u)",
1021 msg->hdr.type, msg->seq);
1022 break;
1023 }
1024
1025 rxrpc_put_message(msg);
1026 }
1027
1028 out:
1029 rxrpc_put_call(call);
1030 _leave("");
1031} /* end rxrpc_call_receive_packet() */
1032
1033/*****************************************************************************/
1034/*
1035 * process next data packet
1036 * - as the next data packet arrives:
1037 * - it is queued on app_readyq _if_ it is the next one expected
1038 * (app_ready_seq+1)
1039 * - it is queued on app_unreadyq _if_ it is not the next one expected
1040 * - if a packet placed on app_readyq completely fills a hole leading up to
1041 * the first packet on app_unreadyq, then packets now in sequence are
1042 * tranferred to app_readyq
1043 * - the application layer can only see packets on app_readyq
1044 * (app_ready_qty bytes)
1045 * - the application layer is prodded every time a new packet arrives
1046 */
1047static void rxrpc_call_receive_data_packet(struct rxrpc_call *call,
1048 struct rxrpc_message *msg)
1049{
1050 const struct rxrpc_operation *optbl, *op;
1051 struct rxrpc_message *pmsg;
1052 struct list_head *_p;
1053 int ret, lo, hi, rmtimo;
1054 __be32 opid;
1055
1056 _enter("%p{%u},%p{%u}", call, ntohl(call->call_id), msg, msg->seq);
1057
1058 rxrpc_get_message(msg);
1059
1060 /* add to the unready queue if we'd have to create a hole in the ready
1061 * queue otherwise */
1062 if (msg->seq != call->app_ready_seq + 1) {
1063 _debug("Call add packet %d to unreadyq", msg->seq);
1064
1065 /* insert in seq order */
1066 list_for_each(_p, &call->app_unreadyq) {
1067 pmsg = list_entry(_p, struct rxrpc_message, link);
1068 if (pmsg->seq > msg->seq)
1069 break;
1070 }
1071
1072 list_add_tail(&msg->link, _p);
1073
1074 _leave(" [unreadyq]");
1075 return;
1076 }
1077
1078 /* next in sequence - simply append into the call's ready queue */
1079 _debug("Call add packet %d to readyq (+%Zd => %Zd bytes)",
1080 msg->seq, msg->dsize, call->app_ready_qty);
1081
1082 spin_lock(&call->lock);
1083 call->app_ready_seq = msg->seq;
1084 call->app_ready_qty += msg->dsize;
1085 list_add_tail(&msg->link, &call->app_readyq);
1086
1087 /* move unready packets to the readyq if we got rid of a hole */
1088 while (!list_empty(&call->app_unreadyq)) {
1089 pmsg = list_entry(call->app_unreadyq.next,
1090 struct rxrpc_message, link);
1091
1092 if (pmsg->seq != call->app_ready_seq + 1)
1093 break;
1094
1095 /* next in sequence - just move list-to-list */
1096 _debug("Call transfer packet %d to readyq (+%Zd => %Zd bytes)",
1097 pmsg->seq, pmsg->dsize, call->app_ready_qty);
1098
1099 call->app_ready_seq = pmsg->seq;
1100 call->app_ready_qty += pmsg->dsize;
1101 list_move_tail(&pmsg->link, &call->app_readyq);
1102 }
1103
1104 /* see if we've got the last packet yet */
1105 if (!list_empty(&call->app_readyq)) {
1106 pmsg = list_entry(call->app_readyq.prev,
1107 struct rxrpc_message, link);
1108 if (pmsg->hdr.flags & RXRPC_LAST_PACKET) {
1109 call->app_last_rcv = 1;
1110 _debug("Last packet on readyq");
1111 }
1112 }
1113
1114 switch (call->app_call_state) {
1115 /* do nothing if call already aborted */
1116 case RXRPC_CSTATE_ERROR:
1117 spin_unlock(&call->lock);
1118 _leave(" [error]");
1119 return;
1120
1121 /* extract the operation ID from an incoming call if that's not
1122 * yet been done */
1123 case RXRPC_CSTATE_SRVR_RCV_OPID:
1124 spin_unlock(&call->lock);
1125
1126 /* handle as yet insufficient data for the operation ID */
1127 if (call->app_ready_qty < 4) {
1128 if (call->app_last_rcv)
1129 /* trouble - last packet seen */
1130 rxrpc_call_abort(call, -EINVAL);
1131
1132 _leave("");
1133 return;
1134 }
1135
1136 /* pull the operation ID out of the buffer */
1137 ret = rxrpc_call_read_data(call, &opid, sizeof(opid), 0);
1138 if (ret < 0) {
1139 printk("Unexpected error from read-data: %d\n", ret);
1140 if (call->app_call_state != RXRPC_CSTATE_ERROR)
1141 rxrpc_call_abort(call, ret);
1142 _leave("");
1143 return;
1144 }
1145 call->app_opcode = ntohl(opid);
1146
1147 /* locate the operation in the available ops table */
1148 optbl = call->conn->service->ops_begin;
1149 lo = 0;
1150 hi = call->conn->service->ops_end - optbl;
1151
1152 while (lo < hi) {
1153 int mid = (hi + lo) / 2;
1154 op = &optbl[mid];
1155 if (call->app_opcode == op->id)
1156 goto found_op;
1157 if (call->app_opcode > op->id)
1158 lo = mid + 1;
1159 else
1160 hi = mid;
1161 }
1162
1163 /* search failed */
1164 kproto("Rx Client requested operation %d from %s service",
1165 call->app_opcode, call->conn->service->name);
1166 rxrpc_call_abort(call, -EINVAL);
1167 _leave(" [inval]");
1168 return;
1169
1170 found_op:
1171 _proto("Rx Client requested operation %s from %s service",
1172 op->name, call->conn->service->name);
1173
1174 /* we're now waiting for the argument block (unless the call
1175 * was aborted) */
1176 spin_lock(&call->lock);
1177 if (call->app_call_state == RXRPC_CSTATE_SRVR_RCV_OPID ||
1178 call->app_call_state == RXRPC_CSTATE_SRVR_SND_REPLY) {
1179 if (!call->app_last_rcv)
1180 call->app_call_state =
1181 RXRPC_CSTATE_SRVR_RCV_ARGS;
1182 else if (call->app_ready_qty > 0)
1183 call->app_call_state =
1184 RXRPC_CSTATE_SRVR_GOT_ARGS;
1185 else
1186 call->app_call_state =
1187 RXRPC_CSTATE_SRVR_SND_REPLY;
1188 call->app_mark = op->asize;
1189 call->app_user = op->user;
1190 }
1191 spin_unlock(&call->lock);
1192
1193 _state(call);
1194 break;
1195
1196 case RXRPC_CSTATE_SRVR_RCV_ARGS:
1197 /* change state if just received last packet of arg block */
1198 if (call->app_last_rcv)
1199 call->app_call_state = RXRPC_CSTATE_SRVR_GOT_ARGS;
1200 spin_unlock(&call->lock);
1201
1202 _state(call);
1203 break;
1204
1205 case RXRPC_CSTATE_CLNT_RCV_REPLY:
1206 /* change state if just received last packet of reply block */
1207 rmtimo = 0;
1208 if (call->app_last_rcv) {
1209 call->app_call_state = RXRPC_CSTATE_CLNT_GOT_REPLY;
1210 rmtimo = 1;
1211 }
1212 spin_unlock(&call->lock);
1213
1214 if (rmtimo) {
1215 del_timer_sync(&call->acks_timeout);
1216 del_timer_sync(&call->rcv_timeout);
1217 del_timer_sync(&call->ackr_dfr_timo);
1218 }
1219
1220 _state(call);
1221 break;
1222
1223 default:
1224 /* deal with data reception in an unexpected state */
1225 printk("Unexpected state [[[ %u ]]]\n", call->app_call_state);
1226 __rxrpc_call_abort(call, -EBADMSG);
1227 _leave("");
1228 return;
1229 }
1230
1231 if (call->app_call_state == RXRPC_CSTATE_CLNT_RCV_REPLY &&
1232 call->app_last_rcv)
1233 BUG();
1234
1235 /* otherwise just invoke the data function whenever we can satisfy its desire for more
1236 * data
1237 */
1238 _proto("Rx Received Op Data: st=%u qty=%Zu mk=%Zu%s",
1239 call->app_call_state, call->app_ready_qty, call->app_mark,
1240 call->app_last_rcv ? " last-rcvd" : "");
1241
1242 spin_lock(&call->lock);
1243
1244 ret = __rxrpc_call_read_data(call);
1245 switch (ret) {
1246 case 0:
1247 spin_unlock(&call->lock);
1248 call->app_attn_func(call);
1249 break;
1250 case -EAGAIN:
1251 spin_unlock(&call->lock);
1252 break;
1253 case -ECONNABORTED:
1254 spin_unlock(&call->lock);
1255 break;
1256 default:
1257 __rxrpc_call_abort(call, ret);
1258 break;
1259 }
1260
1261 _state(call);
1262
1263 _leave("");
1264
1265} /* end rxrpc_call_receive_data_packet() */
1266
1267/*****************************************************************************/
1268/*
1269 * received an ACK packet
1270 */
1271static void rxrpc_call_receive_ack_packet(struct rxrpc_call *call,
1272 struct rxrpc_message *msg)
1273{
1274 struct rxrpc_ackpacket _ack, *ap;
1275 rxrpc_serial_net_t serial;
1276 rxrpc_seq_t seq;
1277 int ret;
1278
1279 _enter("%p{%u},%p{%u}", call, ntohl(call->call_id), msg, msg->seq);
1280
1281 /* extract the basic ACK record */
1282 ap = skb_header_pointer(msg->pkt, msg->offset, sizeof(_ack), &_ack);
1283 if (ap == NULL) {
1284 printk("Rx Received short ACK packet\n");
1285 return;
1286 }
1287 msg->offset += sizeof(_ack);
1288
1289 serial = ap->serial;
1290 seq = ntohl(ap->firstPacket);
1291
1292 _proto("Rx Received ACK %%%d { b=%hu m=%hu f=%u p=%u s=%u r=%s n=%u }",
1293 ntohl(msg->hdr.serial),
1294 ntohs(ap->bufferSpace),
1295 ntohs(ap->maxSkew),
1296 seq,
1297 ntohl(ap->previousPacket),
1298 ntohl(serial),
1299 rxrpc_acks[ap->reason],
1300 call->ackr.nAcks
1301 );
1302
1303 /* check the other side isn't ACK'ing a sequence number I haven't sent
1304 * yet */
1305 if (ap->nAcks > 0 &&
1306 (seq > call->snd_seq_count ||
1307 seq + ap->nAcks - 1 > call->snd_seq_count)) {
1308 printk("Received ACK (#%u-#%u) for unsent packet\n",
1309 seq, seq + ap->nAcks - 1);
1310 rxrpc_call_abort(call, -EINVAL);
1311 _leave("");
1312 return;
1313 }
1314
1315 /* deal with RTT calculation */
1316 if (serial) {
1317 struct rxrpc_message *rttmsg;
1318
1319 /* find the prompting packet */
1320 spin_lock(&call->lock);
1321 if (call->snd_ping && call->snd_ping->hdr.serial == serial) {
1322 /* it was a ping packet */
1323 rttmsg = call->snd_ping;
1324 call->snd_ping = NULL;
1325 spin_unlock(&call->lock);
1326
1327 if (rttmsg) {
1328 rttmsg->rttdone = 1;
1329 rxrpc_peer_calculate_rtt(call->conn->peer,
1330 rttmsg, msg);
1331 rxrpc_put_message(rttmsg);
1332 }
1333 }
1334 else {
1335 struct list_head *_p;
1336
1337 /* it ought to be a data packet - look in the pending
1338 * ACK list */
1339 list_for_each(_p, &call->acks_pendq) {
1340 rttmsg = list_entry(_p, struct rxrpc_message,
1341 link);
1342 if (rttmsg->hdr.serial == serial) {
1343 if (rttmsg->rttdone)
1344 /* never do RTT twice without
1345 * resending */
1346 break;
1347
1348 rttmsg->rttdone = 1;
1349 rxrpc_peer_calculate_rtt(
1350 call->conn->peer, rttmsg, msg);
1351 break;
1352 }
1353 }
1354 spin_unlock(&call->lock);
1355 }
1356 }
1357
1358 switch (ap->reason) {
1359 /* deal with negative/positive acknowledgement of data
1360 * packets */
1361 case RXRPC_ACK_REQUESTED:
1362 case RXRPC_ACK_DELAY:
1363 case RXRPC_ACK_IDLE:
1364 rxrpc_call_definitively_ACK(call, seq - 1);
1365
1366 case RXRPC_ACK_DUPLICATE:
1367 case RXRPC_ACK_OUT_OF_SEQUENCE:
1368 case RXRPC_ACK_EXCEEDS_WINDOW:
1369 call->snd_resend_cnt = 0;
1370 ret = rxrpc_call_record_ACK(call, msg, seq, ap->nAcks);
1371 if (ret < 0)
1372 rxrpc_call_abort(call, ret);
1373 break;
1374
1375 /* respond to ping packets immediately */
1376 case RXRPC_ACK_PING:
1377 rxrpc_call_generate_ACK(call, &msg->hdr, ap);
1378 break;
1379
1380 /* only record RTT on ping response packets */
1381 case RXRPC_ACK_PING_RESPONSE:
1382 if (call->snd_ping) {
1383 struct rxrpc_message *rttmsg;
1384
1385 /* only do RTT stuff if the response matches the
1386 * retained ping */
1387 rttmsg = NULL;
1388 spin_lock(&call->lock);
1389 if (call->snd_ping &&
1390 call->snd_ping->hdr.serial == ap->serial) {
1391 rttmsg = call->snd_ping;
1392 call->snd_ping = NULL;
1393 }
1394 spin_unlock(&call->lock);
1395
1396 if (rttmsg) {
1397 rttmsg->rttdone = 1;
1398 rxrpc_peer_calculate_rtt(call->conn->peer,
1399 rttmsg, msg);
1400 rxrpc_put_message(rttmsg);
1401 }
1402 }
1403 break;
1404
1405 default:
1406 printk("Unsupported ACK reason %u\n", ap->reason);
1407 break;
1408 }
1409
1410 _leave("");
1411} /* end rxrpc_call_receive_ack_packet() */
1412
1413/*****************************************************************************/
1414/*
1415 * record definitive ACKs for all messages up to and including the one with the
1416 * 'highest' seq
1417 */
1418static void rxrpc_call_definitively_ACK(struct rxrpc_call *call,
1419 rxrpc_seq_t highest)
1420{
1421 struct rxrpc_message *msg;
1422 int now_complete;
1423
1424 _enter("%p{ads=%u},%u", call, call->acks_dftv_seq, highest);
1425
1426 while (call->acks_dftv_seq < highest) {
1427 call->acks_dftv_seq++;
1428
1429 _proto("Definitive ACK on packet #%u", call->acks_dftv_seq);
1430
1431 /* discard those at front of queue until message with highest
1432 * ACK is found */
1433 spin_lock(&call->lock);
1434 msg = NULL;
1435 if (!list_empty(&call->acks_pendq)) {
1436 msg = list_entry(call->acks_pendq.next,
1437 struct rxrpc_message, link);
1438 list_del_init(&msg->link); /* dequeue */
1439 if (msg->state == RXRPC_MSG_SENT)
1440 call->acks_pend_cnt--;
1441 }
1442 spin_unlock(&call->lock);
1443
1444 /* insanity check */
1445 if (!msg)
1446 panic("%s(): acks_pendq unexpectedly empty\n",
1447 __FUNCTION__);
1448
1449 if (msg->seq != call->acks_dftv_seq)
1450 panic("%s(): Packet #%u expected at front of acks_pendq"
1451 " (#%u found)\n",
1452 __FUNCTION__, call->acks_dftv_seq, msg->seq);
1453
1454 /* discard the message */
1455 msg->state = RXRPC_MSG_DONE;
1456 rxrpc_put_message(msg);
1457 }
1458
1459 /* if all sent packets are definitively ACK'd then prod any sleepers just in case */
1460 now_complete = 0;
1461 spin_lock(&call->lock);
1462 if (call->acks_dftv_seq == call->snd_seq_count) {
1463 if (call->app_call_state != RXRPC_CSTATE_COMPLETE) {
1464 call->app_call_state = RXRPC_CSTATE_COMPLETE;
1465 _state(call);
1466 now_complete = 1;
1467 }
1468 }
1469 spin_unlock(&call->lock);
1470
1471 if (now_complete) {
1472 del_timer_sync(&call->acks_timeout);
1473 del_timer_sync(&call->rcv_timeout);
1474 del_timer_sync(&call->ackr_dfr_timo);
1475 call->app_attn_func(call);
1476 }
1477
1478 _leave("");
1479} /* end rxrpc_call_definitively_ACK() */
1480
1481/*****************************************************************************/
1482/*
1483 * record the specified amount of ACKs/NAKs
1484 */
1485static int rxrpc_call_record_ACK(struct rxrpc_call *call,
1486 struct rxrpc_message *msg,
1487 rxrpc_seq_t seq,
1488 size_t count)
1489{
1490 struct rxrpc_message *dmsg;
1491 struct list_head *_p;
1492 rxrpc_seq_t highest;
1493 unsigned ix;
1494 size_t chunk;
1495 char resend, now_complete;
1496 u8 acks[16];
1497
1498 _enter("%p{apc=%u ads=%u},%p,%u,%Zu",
1499 call, call->acks_pend_cnt, call->acks_dftv_seq,
1500 msg, seq, count);
1501
1502 /* handle re-ACK'ing of definitively ACK'd packets (may be out-of-order
1503 * ACKs) */
1504 if (seq <= call->acks_dftv_seq) {
1505 unsigned delta = call->acks_dftv_seq - seq;
1506
1507 if (count <= delta) {
1508 _leave(" = 0 [all definitively ACK'd]");
1509 return 0;
1510 }
1511
1512 seq += delta;
1513 count -= delta;
1514 msg->offset += delta;
1515 }
1516
1517 highest = seq + count - 1;
1518 resend = 0;
1519 while (count > 0) {
1520 /* extract up to 16 ACK slots at a time */
1521 chunk = min(count, sizeof(acks));
1522 count -= chunk;
1523
1524 memset(acks, 2, sizeof(acks));
1525
1526 if (skb_copy_bits(msg->pkt, msg->offset, &acks, chunk) < 0) {
1527 printk("Rx Received short ACK packet\n");
1528 _leave(" = -EINVAL");
1529 return -EINVAL;
1530 }
1531 msg->offset += chunk;
1532
1533 /* check that the ACK set is valid */
1534 for (ix = 0; ix < chunk; ix++) {
1535 switch (acks[ix]) {
1536 case RXRPC_ACK_TYPE_ACK:
1537 break;
1538 case RXRPC_ACK_TYPE_NACK:
1539 resend = 1;
1540 break;
1541 default:
1542 printk("Rx Received unsupported ACK state"
1543 " %u\n", acks[ix]);
1544 _leave(" = -EINVAL");
1545 return -EINVAL;
1546 }
1547 }
1548
1549 _proto("Rx ACK of packets #%u-#%u "
1550 "[%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c] (pend=%u)",
1551 seq, (unsigned) (seq + chunk - 1),
1552 _acktype[acks[0x0]],
1553 _acktype[acks[0x1]],
1554 _acktype[acks[0x2]],
1555 _acktype[acks[0x3]],
1556 _acktype[acks[0x4]],
1557 _acktype[acks[0x5]],
1558 _acktype[acks[0x6]],
1559 _acktype[acks[0x7]],
1560 _acktype[acks[0x8]],
1561 _acktype[acks[0x9]],
1562 _acktype[acks[0xA]],
1563 _acktype[acks[0xB]],
1564 _acktype[acks[0xC]],
1565 _acktype[acks[0xD]],
1566 _acktype[acks[0xE]],
1567 _acktype[acks[0xF]],
1568 call->acks_pend_cnt
1569 );
1570
1571 /* mark the packets in the ACK queue as being provisionally
1572 * ACK'd */
1573 ix = 0;
1574 spin_lock(&call->lock);
1575
1576 /* find the first packet ACK'd/NAK'd here */
1577 list_for_each(_p, &call->acks_pendq) {
1578 dmsg = list_entry(_p, struct rxrpc_message, link);
1579 if (dmsg->seq == seq)
1580 goto found_first;
1581 _debug("- %u: skipping #%u", ix, dmsg->seq);
1582 }
1583 goto bad_queue;
1584
1585 found_first:
1586 do {
1587 _debug("- %u: processing #%u (%c) apc=%u",
1588 ix, dmsg->seq, _acktype[acks[ix]],
1589 call->acks_pend_cnt);
1590
1591 if (acks[ix] == RXRPC_ACK_TYPE_ACK) {
1592 if (dmsg->state == RXRPC_MSG_SENT)
1593 call->acks_pend_cnt--;
1594 dmsg->state = RXRPC_MSG_ACKED;
1595 }
1596 else {
1597 if (dmsg->state == RXRPC_MSG_ACKED)
1598 call->acks_pend_cnt++;
1599 dmsg->state = RXRPC_MSG_SENT;
1600 }
1601 ix++;
1602 seq++;
1603
1604 _p = dmsg->link.next;
1605 dmsg = list_entry(_p, struct rxrpc_message, link);
1606 } while(ix < chunk &&
1607 _p != &call->acks_pendq &&
1608 dmsg->seq == seq);
1609
1610 if (ix < chunk)
1611 goto bad_queue;
1612
1613 spin_unlock(&call->lock);
1614 }
1615
1616 if (resend)
1617 rxrpc_call_resend(call, highest);
1618
1619 /* if all packets are provisionally ACK'd, then wake up anyone who's
1620 * waiting for that */
1621 now_complete = 0;
1622 spin_lock(&call->lock);
1623 if (call->acks_pend_cnt == 0) {
1624 if (call->app_call_state == RXRPC_CSTATE_SRVR_RCV_FINAL_ACK) {
1625 call->app_call_state = RXRPC_CSTATE_COMPLETE;
1626 _state(call);
1627 }
1628 now_complete = 1;
1629 }
1630 spin_unlock(&call->lock);
1631
1632 if (now_complete) {
1633 _debug("- wake up waiters");
1634 del_timer_sync(&call->acks_timeout);
1635 del_timer_sync(&call->rcv_timeout);
1636 del_timer_sync(&call->ackr_dfr_timo);
1637 call->app_attn_func(call);
1638 }
1639
1640 _leave(" = 0 (apc=%u)", call->acks_pend_cnt);
1641 return 0;
1642
1643 bad_queue:
1644 panic("%s(): acks_pendq in bad state (packet #%u absent)\n",
1645 __FUNCTION__, seq);
1646
1647} /* end rxrpc_call_record_ACK() */
1648
1649/*****************************************************************************/
1650/*
1651 * transfer data from the ready packet queue to the asynchronous read buffer
1652 * - since this func is the only one going to look at packets queued on
1653 * app_readyq, we don't need a lock to modify or access them, only to modify
1654 * the queue pointers
1655 * - called with call->lock held
1656 * - the buffer must be in kernel space
1657 * - returns:
1658 * 0 if buffer filled
1659 * -EAGAIN if buffer not filled and more data to come
1660 * -EBADMSG if last packet received and insufficient data left
1661 * -ECONNABORTED if the call has in an error state
1662 */
1663static int __rxrpc_call_read_data(struct rxrpc_call *call)
1664{
1665 struct rxrpc_message *msg;
1666 size_t qty;
1667 int ret;
1668
1669 _enter("%p{as=%d buf=%p qty=%Zu/%Zu}",
1670 call,
1671 call->app_async_read, call->app_read_buf,
1672 call->app_ready_qty, call->app_mark);
1673
1674 /* check the state */
1675 switch (call->app_call_state) {
1676 case RXRPC_CSTATE_SRVR_RCV_ARGS:
1677 case RXRPC_CSTATE_CLNT_RCV_REPLY:
1678 if (call->app_last_rcv) {
1679 printk("%s(%p,%p,%Zd):"
1680 " Inconsistent call state (%s, last pkt)",
1681 __FUNCTION__,
1682 call, call->app_read_buf, call->app_mark,
1683 rxrpc_call_states[call->app_call_state]);
1684 BUG();
1685 }
1686 break;
1687
1688 case RXRPC_CSTATE_SRVR_RCV_OPID:
1689 case RXRPC_CSTATE_SRVR_GOT_ARGS:
1690 case RXRPC_CSTATE_CLNT_GOT_REPLY:
1691 break;
1692
1693 case RXRPC_CSTATE_SRVR_SND_REPLY:
1694 if (!call->app_last_rcv) {
1695 printk("%s(%p,%p,%Zd):"
1696 " Inconsistent call state (%s, not last pkt)",
1697 __FUNCTION__,
1698 call, call->app_read_buf, call->app_mark,
1699 rxrpc_call_states[call->app_call_state]);
1700 BUG();
1701 }
1702 _debug("Trying to read data from call in SND_REPLY state");
1703 break;
1704
1705 case RXRPC_CSTATE_ERROR:
1706 _leave(" = -ECONNABORTED");
1707 return -ECONNABORTED;
1708
1709 default:
1710 printk("reading in unexpected state [[[ %u ]]]\n",
1711 call->app_call_state);
1712 BUG();
1713 }
1714
1715 /* handle the case of not having an async buffer */
1716 if (!call->app_async_read) {
1717 if (call->app_mark == RXRPC_APP_MARK_EOF) {
1718 ret = call->app_last_rcv ? 0 : -EAGAIN;
1719 }
1720 else {
1721 if (call->app_mark >= call->app_ready_qty) {
1722 call->app_mark = RXRPC_APP_MARK_EOF;
1723 ret = 0;
1724 }
1725 else {
1726 ret = call->app_last_rcv ? -EBADMSG : -EAGAIN;
1727 }
1728 }
1729
1730 _leave(" = %d [no buf]", ret);
1731 return 0;
1732 }
1733
1734 while (!list_empty(&call->app_readyq) && call->app_mark > 0) {
1735 msg = list_entry(call->app_readyq.next,
1736 struct rxrpc_message, link);
1737
1738 /* drag as much data as we need out of this packet */
1739 qty = min(call->app_mark, msg->dsize);
1740
1741 _debug("reading %Zu from skb=%p off=%lu",
1742 qty, msg->pkt, msg->offset);
1743
1744 if (call->app_read_buf)
1745 if (skb_copy_bits(msg->pkt, msg->offset,
1746 call->app_read_buf, qty) < 0)
1747 panic("%s: Failed to copy data from packet:"
1748 " (%p,%p,%Zd)",
1749 __FUNCTION__,
1750 call, call->app_read_buf, qty);
1751
1752 /* if that packet is now empty, discard it */
1753 call->app_ready_qty -= qty;
1754 msg->dsize -= qty;
1755
1756 if (msg->dsize == 0) {
1757 list_del_init(&msg->link);
1758 rxrpc_put_message(msg);
1759 }
1760 else {
1761 msg->offset += qty;
1762 }
1763
1764 call->app_mark -= qty;
1765 if (call->app_read_buf)
1766 call->app_read_buf += qty;
1767 }
1768
1769 if (call->app_mark == 0) {
1770 call->app_async_read = 0;
1771 call->app_mark = RXRPC_APP_MARK_EOF;
1772 call->app_read_buf = NULL;
1773
1774 /* adjust the state if used up all packets */
1775 if (list_empty(&call->app_readyq) && call->app_last_rcv) {
1776 switch (call->app_call_state) {
1777 case RXRPC_CSTATE_SRVR_RCV_OPID:
1778 call->app_call_state = RXRPC_CSTATE_SRVR_SND_REPLY;
1779 call->app_mark = RXRPC_APP_MARK_EOF;
1780 _state(call);
1781 del_timer_sync(&call->rcv_timeout);
1782 break;
1783 case RXRPC_CSTATE_SRVR_GOT_ARGS:
1784 call->app_call_state = RXRPC_CSTATE_SRVR_SND_REPLY;
1785 _state(call);
1786 del_timer_sync(&call->rcv_timeout);
1787 break;
1788 default:
1789 call->app_call_state = RXRPC_CSTATE_COMPLETE;
1790 _state(call);
1791 del_timer_sync(&call->acks_timeout);
1792 del_timer_sync(&call->ackr_dfr_timo);
1793 del_timer_sync(&call->rcv_timeout);
1794 break;
1795 }
1796 }
1797
1798 _leave(" = 0");
1799 return 0;
1800 }
1801
1802 if (call->app_last_rcv) {
1803 _debug("Insufficient data (%Zu/%Zu)",
1804 call->app_ready_qty, call->app_mark);
1805 call->app_async_read = 0;
1806 call->app_mark = RXRPC_APP_MARK_EOF;
1807 call->app_read_buf = NULL;
1808
1809 _leave(" = -EBADMSG");
1810 return -EBADMSG;
1811 }
1812
1813 _leave(" = -EAGAIN");
1814 return -EAGAIN;
1815} /* end __rxrpc_call_read_data() */
1816
1817/*****************************************************************************/
1818/*
1819 * attempt to read the specified amount of data from the call's ready queue
1820 * into the buffer provided
1821 * - since this func is the only one going to look at packets queued on
1822 * app_readyq, we don't need a lock to modify or access them, only to modify
1823 * the queue pointers
1824 * - if the buffer pointer is NULL, then data is merely drained, not copied
1825 * - if flags&RXRPC_CALL_READ_BLOCK, then the function will wait until there is
1826 * enough data or an error will be generated
1827 * - note that the caller must have added the calling task to the call's wait
1828 * queue beforehand
1829 * - if flags&RXRPC_CALL_READ_ALL, then an error will be generated if this
1830 * function doesn't read all available data
1831 */
1832int rxrpc_call_read_data(struct rxrpc_call *call,
1833 void *buffer, size_t size, int flags)
1834{
1835 int ret;
1836
1837 _enter("%p{arq=%Zu},%p,%Zd,%x",
1838 call, call->app_ready_qty, buffer, size, flags);
1839
1840 spin_lock(&call->lock);
1841
1842 if (unlikely(!!call->app_read_buf)) {
1843 spin_unlock(&call->lock);
1844 _leave(" = -EBUSY");
1845 return -EBUSY;
1846 }
1847
1848 call->app_mark = size;
1849 call->app_read_buf = buffer;
1850 call->app_async_read = 1;
1851 call->app_read_count++;
1852
1853 /* read as much data as possible */
1854 ret = __rxrpc_call_read_data(call);
1855 switch (ret) {
1856 case 0:
1857 if (flags & RXRPC_CALL_READ_ALL &&
1858 (!call->app_last_rcv || call->app_ready_qty > 0)) {
1859 _leave(" = -EBADMSG");
1860 __rxrpc_call_abort(call, -EBADMSG);
1861 return -EBADMSG;
1862 }
1863
1864 spin_unlock(&call->lock);
1865 call->app_attn_func(call);
1866 _leave(" = 0");
1867 return ret;
1868
1869 case -ECONNABORTED:
1870 spin_unlock(&call->lock);
1871 _leave(" = %d [aborted]", ret);
1872 return ret;
1873
1874 default:
1875 __rxrpc_call_abort(call, ret);
1876 _leave(" = %d", ret);
1877 return ret;
1878
1879 case -EAGAIN:
1880 spin_unlock(&call->lock);
1881
1882 if (!(flags & RXRPC_CALL_READ_BLOCK)) {
1883 _leave(" = -EAGAIN");
1884 return -EAGAIN;
1885 }
1886
1887 /* wait for the data to arrive */
1888 _debug("blocking for data arrival");
1889
1890 for (;;) {
1891 set_current_state(TASK_INTERRUPTIBLE);
1892 if (!call->app_async_read || signal_pending(current))
1893 break;
1894 schedule();
1895 }
1896 set_current_state(TASK_RUNNING);
1897
1898 if (signal_pending(current)) {
1899 _leave(" = -EINTR");
1900 return -EINTR;
1901 }
1902
1903 if (call->app_call_state == RXRPC_CSTATE_ERROR) {
1904 _leave(" = -ECONNABORTED");
1905 return -ECONNABORTED;
1906 }
1907
1908 _leave(" = 0");
1909 return 0;
1910 }
1911
1912} /* end rxrpc_call_read_data() */
1913
1914/*****************************************************************************/
1915/*
1916 * write data to a call
1917 * - the data may not be sent immediately if it doesn't fill a buffer
1918 * - if we can't queue all the data for buffering now, siov[] will have been
1919 * adjusted to take account of what has been sent
1920 */
1921int rxrpc_call_write_data(struct rxrpc_call *call,
1922 size_t sioc,
1923 struct kvec *siov,
1924 u8 rxhdr_flags,
1925 gfp_t alloc_flags,
1926 int dup_data,
1927 size_t *size_sent)
1928{
1929 struct rxrpc_message *msg;
1930 struct kvec *sptr;
1931 size_t space, size, chunk, tmp;
1932 char *buf;
1933 int ret;
1934
1935 _enter("%p,%Zu,%p,%02x,%x,%d,%p",
1936 call, sioc, siov, rxhdr_flags, alloc_flags, dup_data,
1937 size_sent);
1938
1939 *size_sent = 0;
1940 size = 0;
1941 ret = -EINVAL;
1942
1943 /* can't send more if we've sent last packet from this end */
1944 switch (call->app_call_state) {
1945 case RXRPC_CSTATE_SRVR_SND_REPLY:
1946 case RXRPC_CSTATE_CLNT_SND_ARGS:
1947 break;
1948 case RXRPC_CSTATE_ERROR:
1949 ret = call->app_errno;
1950 default:
1951 goto out;
1952 }
1953
1954 /* calculate how much data we've been given */
1955 sptr = siov;
1956 for (; sioc > 0; sptr++, sioc--) {
1957 if (!sptr->iov_len)
1958 continue;
1959
1960 if (!sptr->iov_base)
1961 goto out;
1962
1963 size += sptr->iov_len;
1964 }
1965
1966 _debug("- size=%Zu mtu=%Zu", size, call->conn->mtu_size);
1967
1968 do {
1969 /* make sure there's a message under construction */
1970 if (!call->snd_nextmsg) {
1971 /* no - allocate a message with no data yet attached */
1972 ret = rxrpc_conn_newmsg(call->conn, call,
1973 RXRPC_PACKET_TYPE_DATA,
1974 0, NULL, alloc_flags,
1975 &call->snd_nextmsg);
1976 if (ret < 0)
1977 goto out;
1978 _debug("- allocated new message [ds=%Zu]",
1979 call->snd_nextmsg->dsize);
1980 }
1981
1982 msg = call->snd_nextmsg;
1983 msg->hdr.flags |= rxhdr_flags;
1984
1985 /* deal with zero-length terminal packet */
1986 if (size == 0) {
1987 if (rxhdr_flags & RXRPC_LAST_PACKET) {
1988 ret = rxrpc_call_flush(call);
1989 if (ret < 0)
1990 goto out;
1991 }
1992 break;
1993 }
1994
1995 /* work out how much space current packet has available */
1996 space = call->conn->mtu_size - msg->dsize;
1997 chunk = min(space, size);
1998
1999 _debug("- [before] space=%Zu chunk=%Zu", space, chunk);
2000
2001 while (!siov->iov_len)
2002 siov++;
2003
2004 /* if we are going to have to duplicate the data then coalesce
2005 * it too */
2006 if (dup_data) {
2007 /* don't allocate more that 1 page at a time */
2008 if (chunk > PAGE_SIZE)
2009 chunk = PAGE_SIZE;
2010
2011 /* allocate a data buffer and attach to the message */
2012 buf = kmalloc(chunk, alloc_flags);
2013 if (unlikely(!buf)) {
2014 if (msg->dsize ==
2015 sizeof(struct rxrpc_header)) {
2016 /* discard an empty msg and wind back
2017 * the seq counter */
2018 rxrpc_put_message(msg);
2019 call->snd_nextmsg = NULL;
2020 call->snd_seq_count--;
2021 }
2022
2023 ret = -ENOMEM;
2024 goto out;
2025 }
2026
2027 tmp = msg->dcount++;
2028 set_bit(tmp, &msg->dfree);
2029 msg->data[tmp].iov_base = buf;
2030 msg->data[tmp].iov_len = chunk;
2031 msg->dsize += chunk;
2032 *size_sent += chunk;
2033 size -= chunk;
2034
2035 /* load the buffer with data */
2036 while (chunk > 0) {
2037 tmp = min(chunk, siov->iov_len);
2038 memcpy(buf, siov->iov_base, tmp);
2039 buf += tmp;
2040 siov->iov_base += tmp;
2041 siov->iov_len -= tmp;
2042 if (!siov->iov_len)
2043 siov++;
2044 chunk -= tmp;
2045 }
2046 }
2047 else {
2048 /* we want to attach the supplied buffers directly */
2049 while (chunk > 0 &&
2050 msg->dcount < RXRPC_MSG_MAX_IOCS) {
2051 tmp = msg->dcount++;
2052 msg->data[tmp].iov_base = siov->iov_base;
2053 msg->data[tmp].iov_len = siov->iov_len;
2054 msg->dsize += siov->iov_len;
2055 *size_sent += siov->iov_len;
2056 size -= siov->iov_len;
2057 chunk -= siov->iov_len;
2058 siov++;
2059 }
2060 }
2061
2062 _debug("- [loaded] chunk=%Zu size=%Zu", chunk, size);
2063
2064 /* dispatch the message when full, final or requesting ACK */
2065 if (msg->dsize >= call->conn->mtu_size || rxhdr_flags) {
2066 ret = rxrpc_call_flush(call);
2067 if (ret < 0)
2068 goto out;
2069 }
2070
2071 } while(size > 0);
2072
2073 ret = 0;
2074 out:
2075 _leave(" = %d (%Zd queued, %Zd rem)", ret, *size_sent, size);
2076 return ret;
2077
2078} /* end rxrpc_call_write_data() */
2079
2080/*****************************************************************************/
2081/*
2082 * flush outstanding packets to the network
2083 */
2084static int rxrpc_call_flush(struct rxrpc_call *call)
2085{
2086 struct rxrpc_message *msg;
2087 int ret = 0;
2088
2089 _enter("%p", call);
2090
2091 rxrpc_get_call(call);
2092
2093 /* if there's a packet under construction, then dispatch it now */
2094 if (call->snd_nextmsg) {
2095 msg = call->snd_nextmsg;
2096 call->snd_nextmsg = NULL;
2097
2098 if (msg->hdr.flags & RXRPC_LAST_PACKET) {
2099 msg->hdr.flags &= ~RXRPC_MORE_PACKETS;
2100 if (call->app_call_state != RXRPC_CSTATE_CLNT_SND_ARGS)
2101 msg->hdr.flags |= RXRPC_REQUEST_ACK;
2102 }
2103 else {
2104 msg->hdr.flags |= RXRPC_MORE_PACKETS;
2105 }
2106
2107 _proto("Sending DATA message { ds=%Zu dc=%u df=%02lu }",
2108 msg->dsize, msg->dcount, msg->dfree);
2109
2110 /* queue and adjust call state */
2111 spin_lock(&call->lock);
2112 list_add_tail(&msg->link, &call->acks_pendq);
2113
2114 /* decide what to do depending on current state and if this is
2115 * the last packet */
2116 ret = -EINVAL;
2117 switch (call->app_call_state) {
2118 case RXRPC_CSTATE_SRVR_SND_REPLY:
2119 if (msg->hdr.flags & RXRPC_LAST_PACKET) {
2120 call->app_call_state =
2121 RXRPC_CSTATE_SRVR_RCV_FINAL_ACK;
2122 _state(call);
2123 }
2124 break;
2125
2126 case RXRPC_CSTATE_CLNT_SND_ARGS:
2127 if (msg->hdr.flags & RXRPC_LAST_PACKET) {
2128 call->app_call_state =
2129 RXRPC_CSTATE_CLNT_RCV_REPLY;
2130 _state(call);
2131 }
2132 break;
2133
2134 case RXRPC_CSTATE_ERROR:
2135 ret = call->app_errno;
2136 default:
2137 spin_unlock(&call->lock);
2138 goto out;
2139 }
2140
2141 call->acks_pend_cnt++;
2142
2143 mod_timer(&call->acks_timeout,
2144 __rxrpc_rtt_based_timeout(call,
2145 rxrpc_call_acks_timeout));
2146
2147 spin_unlock(&call->lock);
2148
2149 ret = rxrpc_conn_sendmsg(call->conn, msg);
2150 if (ret == 0)
2151 call->pkt_snd_count++;
2152 }
2153
2154 out:
2155 rxrpc_put_call(call);
2156
2157 _leave(" = %d", ret);
2158 return ret;
2159
2160} /* end rxrpc_call_flush() */
2161
2162/*****************************************************************************/
2163/*
2164 * resend NAK'd or unacknowledged packets up to the highest one specified
2165 */
2166static void rxrpc_call_resend(struct rxrpc_call *call, rxrpc_seq_t highest)
2167{
2168 struct rxrpc_message *msg;
2169 struct list_head *_p;
2170 rxrpc_seq_t seq = 0;
2171
2172 _enter("%p,%u", call, highest);
2173
2174 _proto("Rx Resend required");
2175
2176 /* handle too many resends */
2177 if (call->snd_resend_cnt >= rxrpc_call_max_resend) {
2178 _debug("Aborting due to too many resends (rcv=%d)",
2179 call->pkt_rcv_count);
2180 rxrpc_call_abort(call,
2181 call->pkt_rcv_count > 0 ? -EIO : -ETIMEDOUT);
2182 _leave("");
2183 return;
2184 }
2185
2186 spin_lock(&call->lock);
2187 call->snd_resend_cnt++;
2188 for (;;) {
2189 /* determine which the next packet we might need to ACK is */
2190 if (seq <= call->acks_dftv_seq)
2191 seq = call->acks_dftv_seq;
2192 seq++;
2193
2194 if (seq > highest)
2195 break;
2196
2197 /* look for the packet in the pending-ACK queue */
2198 list_for_each(_p, &call->acks_pendq) {
2199 msg = list_entry(_p, struct rxrpc_message, link);
2200 if (msg->seq == seq)
2201 goto found_msg;
2202 }
2203
2204 panic("%s(%p,%d):"
2205 " Inconsistent pending-ACK queue (ds=%u sc=%u sq=%u)\n",
2206 __FUNCTION__, call, highest,
2207 call->acks_dftv_seq, call->snd_seq_count, seq);
2208
2209 found_msg:
2210 if (msg->state != RXRPC_MSG_SENT)
2211 continue; /* only un-ACK'd packets */
2212
2213 rxrpc_get_message(msg);
2214 spin_unlock(&call->lock);
2215
2216 /* send each message again (and ignore any errors we might
2217 * incur) */
2218 _proto("Resending DATA message { ds=%Zu dc=%u df=%02lu }",
2219 msg->dsize, msg->dcount, msg->dfree);
2220
2221 if (rxrpc_conn_sendmsg(call->conn, msg) == 0)
2222 call->pkt_snd_count++;
2223
2224 rxrpc_put_message(msg);
2225
2226 spin_lock(&call->lock);
2227 }
2228
2229 /* reset the timeout */
2230 mod_timer(&call->acks_timeout,
2231 __rxrpc_rtt_based_timeout(call, rxrpc_call_acks_timeout));
2232
2233 spin_unlock(&call->lock);
2234
2235 _leave("");
2236} /* end rxrpc_call_resend() */
2237
2238/*****************************************************************************/
2239/*
2240 * handle an ICMP error being applied to a call
2241 */
2242void rxrpc_call_handle_error(struct rxrpc_call *call, int local, int errno)
2243{
2244 _enter("%p{%u},%d", call, ntohl(call->call_id), errno);
2245
2246 /* if this call is already aborted, then just wake up any waiters */
2247 if (call->app_call_state == RXRPC_CSTATE_ERROR) {
2248 call->app_error_func(call);
2249 }
2250 else {
2251 /* tell the app layer what happened */
2252 spin_lock(&call->lock);
2253 call->app_call_state = RXRPC_CSTATE_ERROR;
2254 _state(call);
2255 if (local)
2256 call->app_err_state = RXRPC_ESTATE_LOCAL_ERROR;
2257 else
2258 call->app_err_state = RXRPC_ESTATE_REMOTE_ERROR;
2259 call->app_errno = errno;
2260 call->app_mark = RXRPC_APP_MARK_EOF;
2261 call->app_read_buf = NULL;
2262 call->app_async_read = 0;
2263
2264 /* map the error */
2265 call->app_aemap_func(call);
2266
2267 del_timer_sync(&call->acks_timeout);
2268 del_timer_sync(&call->rcv_timeout);
2269 del_timer_sync(&call->ackr_dfr_timo);
2270
2271 spin_unlock(&call->lock);
2272
2273 call->app_error_func(call);
2274 }
2275
2276 _leave("");
2277} /* end rxrpc_call_handle_error() */
diff --git a/net/rxrpc/connection.c b/net/rxrpc/connection.c
deleted file mode 100644
index 665a99952440..000000000000
--- a/net/rxrpc/connection.c
+++ /dev/null
@@ -1,777 +0,0 @@
1/* connection.c: Rx connection routines
2 *
3 * Copyright (C) 2002 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/sched.h>
13#include <linux/slab.h>
14#include <linux/module.h>
15#include <rxrpc/rxrpc.h>
16#include <rxrpc/transport.h>
17#include <rxrpc/peer.h>
18#include <rxrpc/connection.h>
19#include <rxrpc/call.h>
20#include <rxrpc/message.h>
21#include <linux/udp.h>
22#include <linux/ip.h>
23#include <net/sock.h>
24#include <asm/uaccess.h>
25#include "internal.h"
26
27__RXACCT_DECL(atomic_t rxrpc_connection_count);
28
29LIST_HEAD(rxrpc_conns);
30DECLARE_RWSEM(rxrpc_conns_sem);
31unsigned long rxrpc_conn_timeout = 60 * 60;
32
33static void rxrpc_conn_do_timeout(struct rxrpc_connection *conn);
34
35static void __rxrpc_conn_timeout(rxrpc_timer_t *timer)
36{
37 struct rxrpc_connection *conn =
38 list_entry(timer, struct rxrpc_connection, timeout);
39
40 _debug("Rx CONN TIMEOUT [%p{u=%d}]", conn, atomic_read(&conn->usage));
41
42 rxrpc_conn_do_timeout(conn);
43}
44
45static const struct rxrpc_timer_ops rxrpc_conn_timer_ops = {
46 .timed_out = __rxrpc_conn_timeout,
47};
48
49/*****************************************************************************/
50/*
51 * create a new connection record
52 */
53static inline int __rxrpc_create_connection(struct rxrpc_peer *peer,
54 struct rxrpc_connection **_conn)
55{
56 struct rxrpc_connection *conn;
57
58 _enter("%p",peer);
59
60 /* allocate and initialise a connection record */
61 conn = kzalloc(sizeof(struct rxrpc_connection), GFP_KERNEL);
62 if (!conn) {
63 _leave(" = -ENOMEM");
64 return -ENOMEM;
65 }
66
67 atomic_set(&conn->usage, 1);
68
69 INIT_LIST_HEAD(&conn->link);
70 INIT_LIST_HEAD(&conn->id_link);
71 init_waitqueue_head(&conn->chanwait);
72 spin_lock_init(&conn->lock);
73 rxrpc_timer_init(&conn->timeout, &rxrpc_conn_timer_ops);
74
75 do_gettimeofday(&conn->atime);
76 conn->mtu_size = 1024;
77 conn->peer = peer;
78 conn->trans = peer->trans;
79
80 __RXACCT(atomic_inc(&rxrpc_connection_count));
81 *_conn = conn;
82 _leave(" = 0 (%p)", conn);
83
84 return 0;
85} /* end __rxrpc_create_connection() */
86
87/*****************************************************************************/
88/*
89 * create a new connection record for outgoing connections
90 */
91int rxrpc_create_connection(struct rxrpc_transport *trans,
92 __be16 port,
93 __be32 addr,
94 uint16_t service_id,
95 void *security,
96 struct rxrpc_connection **_conn)
97{
98 struct rxrpc_connection *candidate, *conn;
99 struct rxrpc_peer *peer;
100 struct list_head *_p;
101 __be32 connid;
102 int ret;
103
104 _enter("%p{%hu},%u,%hu", trans, trans->port, ntohs(port), service_id);
105
106 /* get a peer record */
107 ret = rxrpc_peer_lookup(trans, addr, &peer);
108 if (ret < 0) {
109 _leave(" = %d", ret);
110 return ret;
111 }
112
113 /* allocate and initialise a connection record */
114 ret = __rxrpc_create_connection(peer, &candidate);
115 if (ret < 0) {
116 rxrpc_put_peer(peer);
117 _leave(" = %d", ret);
118 return ret;
119 }
120
121 /* fill in the specific bits */
122 candidate->addr.sin_family = AF_INET;
123 candidate->addr.sin_port = port;
124 candidate->addr.sin_addr.s_addr = addr;
125
126 candidate->in_epoch = rxrpc_epoch;
127 candidate->out_epoch = rxrpc_epoch;
128 candidate->in_clientflag = 0;
129 candidate->out_clientflag = RXRPC_CLIENT_INITIATED;
130 candidate->service_id = htons(service_id);
131
132 /* invent a unique connection ID */
133 write_lock(&peer->conn_idlock);
134
135 try_next_id:
136 connid = htonl(peer->conn_idcounter & RXRPC_CIDMASK);
137 peer->conn_idcounter += RXRPC_MAXCALLS;
138
139 list_for_each(_p, &peer->conn_idlist) {
140 conn = list_entry(_p, struct rxrpc_connection, id_link);
141 if (connid == conn->conn_id)
142 goto try_next_id;
143 if (connid > conn->conn_id)
144 break;
145 }
146
147 _debug("selected candidate conn ID %x.%u",
148 ntohl(peer->addr.s_addr), ntohl(connid));
149
150 candidate->conn_id = connid;
151 list_add_tail(&candidate->id_link, _p);
152
153 write_unlock(&peer->conn_idlock);
154
155 /* attach to peer */
156 candidate->peer = peer;
157
158 write_lock(&peer->conn_lock);
159
160 /* search the peer's transport graveyard list */
161 spin_lock(&peer->conn_gylock);
162 list_for_each(_p, &peer->conn_graveyard) {
163 conn = list_entry(_p, struct rxrpc_connection, link);
164 if (conn->addr.sin_port == candidate->addr.sin_port &&
165 conn->security_ix == candidate->security_ix &&
166 conn->service_id == candidate->service_id &&
167 conn->in_clientflag == 0)
168 goto found_in_graveyard;
169 }
170 spin_unlock(&peer->conn_gylock);
171
172 /* pick the new candidate */
173 _debug("created connection: {%08x} [out]", ntohl(candidate->conn_id));
174 atomic_inc(&peer->conn_count);
175 conn = candidate;
176 candidate = NULL;
177
178 make_active:
179 list_add_tail(&conn->link, &peer->conn_active);
180 write_unlock(&peer->conn_lock);
181
182 if (candidate) {
183 write_lock(&peer->conn_idlock);
184 list_del(&candidate->id_link);
185 write_unlock(&peer->conn_idlock);
186
187 __RXACCT(atomic_dec(&rxrpc_connection_count));
188 kfree(candidate);
189 }
190 else {
191 down_write(&rxrpc_conns_sem);
192 list_add_tail(&conn->proc_link, &rxrpc_conns);
193 up_write(&rxrpc_conns_sem);
194 }
195
196 *_conn = conn;
197 _leave(" = 0 (%p)", conn);
198
199 return 0;
200
201 /* handle resurrecting a connection from the graveyard */
202 found_in_graveyard:
203 _debug("resurrecting connection: {%08x} [out]", ntohl(conn->conn_id));
204 rxrpc_get_connection(conn);
205 rxrpc_krxtimod_del_timer(&conn->timeout);
206 list_del_init(&conn->link);
207 spin_unlock(&peer->conn_gylock);
208 goto make_active;
209} /* end rxrpc_create_connection() */
210
211/*****************************************************************************/
212/*
213 * lookup the connection for an incoming packet
214 * - create a new connection record for unrecorded incoming connections
215 */
216int rxrpc_connection_lookup(struct rxrpc_peer *peer,
217 struct rxrpc_message *msg,
218 struct rxrpc_connection **_conn)
219{
220 struct rxrpc_connection *conn, *candidate = NULL;
221 struct list_head *_p;
222 struct sk_buff *pkt = msg->pkt;
223 int ret, fresh = 0;
224 __be32 x_epoch, x_connid;
225 __be16 x_port, x_servid;
226 __u32 x_secix;
227 u8 x_clflag;
228
229 _enter("%p{{%hu}},%u,%hu",
230 peer,
231 peer->trans->port,
232 ntohs(udp_hdr(pkt)->source),
233 ntohs(msg->hdr.serviceId));
234
235 x_port = udp_hdr(pkt)->source;
236 x_epoch = msg->hdr.epoch;
237 x_clflag = msg->hdr.flags & RXRPC_CLIENT_INITIATED;
238 x_connid = htonl(ntohl(msg->hdr.cid) & RXRPC_CIDMASK);
239 x_servid = msg->hdr.serviceId;
240 x_secix = msg->hdr.securityIndex;
241
242 /* [common case] search the transport's active list first */
243 read_lock(&peer->conn_lock);
244 list_for_each(_p, &peer->conn_active) {
245 conn = list_entry(_p, struct rxrpc_connection, link);
246 if (conn->addr.sin_port == x_port &&
247 conn->in_epoch == x_epoch &&
248 conn->conn_id == x_connid &&
249 conn->security_ix == x_secix &&
250 conn->service_id == x_servid &&
251 conn->in_clientflag == x_clflag)
252 goto found_active;
253 }
254 read_unlock(&peer->conn_lock);
255
256 /* [uncommon case] not active
257 * - create a candidate for a new record if an inbound connection
258 * - only examine the graveyard for an outbound connection
259 */
260 if (x_clflag) {
261 ret = __rxrpc_create_connection(peer, &candidate);
262 if (ret < 0) {
263 _leave(" = %d", ret);
264 return ret;
265 }
266
267 /* fill in the specifics */
268 candidate->addr.sin_family = AF_INET;
269 candidate->addr.sin_port = x_port;
270 candidate->addr.sin_addr.s_addr = ip_hdr(pkt)->saddr;
271 candidate->in_epoch = x_epoch;
272 candidate->out_epoch = x_epoch;
273 candidate->in_clientflag = RXRPC_CLIENT_INITIATED;
274 candidate->out_clientflag = 0;
275 candidate->conn_id = x_connid;
276 candidate->service_id = x_servid;
277 candidate->security_ix = x_secix;
278 }
279
280 /* search the active list again, just in case it appeared whilst we
281 * were busy */
282 write_lock(&peer->conn_lock);
283 list_for_each(_p, &peer->conn_active) {
284 conn = list_entry(_p, struct rxrpc_connection, link);
285 if (conn->addr.sin_port == x_port &&
286 conn->in_epoch == x_epoch &&
287 conn->conn_id == x_connid &&
288 conn->security_ix == x_secix &&
289 conn->service_id == x_servid &&
290 conn->in_clientflag == x_clflag)
291 goto found_active_second_chance;
292 }
293
294 /* search the transport's graveyard list */
295 spin_lock(&peer->conn_gylock);
296 list_for_each(_p, &peer->conn_graveyard) {
297 conn = list_entry(_p, struct rxrpc_connection, link);
298 if (conn->addr.sin_port == x_port &&
299 conn->in_epoch == x_epoch &&
300 conn->conn_id == x_connid &&
301 conn->security_ix == x_secix &&
302 conn->service_id == x_servid &&
303 conn->in_clientflag == x_clflag)
304 goto found_in_graveyard;
305 }
306 spin_unlock(&peer->conn_gylock);
307
308 /* outbound connections aren't created here */
309 if (!x_clflag) {
310 write_unlock(&peer->conn_lock);
311 _leave(" = -ENOENT");
312 return -ENOENT;
313 }
314
315 /* we can now add the new candidate to the list */
316 _debug("created connection: {%08x} [in]", ntohl(candidate->conn_id));
317 rxrpc_get_peer(peer);
318 conn = candidate;
319 candidate = NULL;
320 atomic_inc(&peer->conn_count);
321 fresh = 1;
322
323 make_active:
324 list_add_tail(&conn->link, &peer->conn_active);
325
326 success_uwfree:
327 write_unlock(&peer->conn_lock);
328
329 if (candidate) {
330 write_lock(&peer->conn_idlock);
331 list_del(&candidate->id_link);
332 write_unlock(&peer->conn_idlock);
333
334 __RXACCT(atomic_dec(&rxrpc_connection_count));
335 kfree(candidate);
336 }
337
338 if (fresh) {
339 down_write(&rxrpc_conns_sem);
340 list_add_tail(&conn->proc_link, &rxrpc_conns);
341 up_write(&rxrpc_conns_sem);
342 }
343
344 success:
345 *_conn = conn;
346 _leave(" = 0 (%p)", conn);
347 return 0;
348
349 /* handle the connection being found in the active list straight off */
350 found_active:
351 rxrpc_get_connection(conn);
352 read_unlock(&peer->conn_lock);
353 goto success;
354
355 /* handle resurrecting a connection from the graveyard */
356 found_in_graveyard:
357 _debug("resurrecting connection: {%08x} [in]", ntohl(conn->conn_id));
358 rxrpc_get_peer(peer);
359 rxrpc_get_connection(conn);
360 rxrpc_krxtimod_del_timer(&conn->timeout);
361 list_del_init(&conn->link);
362 spin_unlock(&peer->conn_gylock);
363 goto make_active;
364
365 /* handle finding the connection on the second time through the active
366 * list */
367 found_active_second_chance:
368 rxrpc_get_connection(conn);
369 goto success_uwfree;
370
371} /* end rxrpc_connection_lookup() */
372
373/*****************************************************************************/
374/*
375 * finish using a connection record
376 * - it will be transferred to the peer's connection graveyard when refcount
377 * reaches 0
378 */
379void rxrpc_put_connection(struct rxrpc_connection *conn)
380{
381 struct rxrpc_peer *peer;
382
383 if (!conn)
384 return;
385
386 _enter("%p{u=%d p=%hu}",
387 conn, atomic_read(&conn->usage), ntohs(conn->addr.sin_port));
388
389 peer = conn->peer;
390 spin_lock(&peer->conn_gylock);
391
392 /* sanity check */
393 if (atomic_read(&conn->usage) <= 0)
394 BUG();
395
396 if (likely(!atomic_dec_and_test(&conn->usage))) {
397 spin_unlock(&peer->conn_gylock);
398 _leave("");
399 return;
400 }
401
402 /* move to graveyard queue */
403 _debug("burying connection: {%08x}", ntohl(conn->conn_id));
404 list_move_tail(&conn->link, &peer->conn_graveyard);
405
406 rxrpc_krxtimod_add_timer(&conn->timeout, rxrpc_conn_timeout * HZ);
407
408 spin_unlock(&peer->conn_gylock);
409
410 rxrpc_put_peer(conn->peer);
411
412 _leave(" [killed]");
413} /* end rxrpc_put_connection() */
414
415/*****************************************************************************/
416/*
417 * free a connection record
418 */
419static void rxrpc_conn_do_timeout(struct rxrpc_connection *conn)
420{
421 struct rxrpc_peer *peer;
422
423 _enter("%p{u=%d p=%hu}",
424 conn, atomic_read(&conn->usage), ntohs(conn->addr.sin_port));
425
426 peer = conn->peer;
427
428 if (atomic_read(&conn->usage) < 0)
429 BUG();
430
431 /* remove from graveyard if still dead */
432 spin_lock(&peer->conn_gylock);
433 if (atomic_read(&conn->usage) == 0) {
434 list_del_init(&conn->link);
435 }
436 else {
437 conn = NULL;
438 }
439 spin_unlock(&peer->conn_gylock);
440
441 if (!conn) {
442 _leave("");
443 return; /* resurrected */
444 }
445
446 _debug("--- Destroying Connection %p{%08x} ---",
447 conn, ntohl(conn->conn_id));
448
449 down_write(&rxrpc_conns_sem);
450 list_del(&conn->proc_link);
451 up_write(&rxrpc_conns_sem);
452
453 write_lock(&peer->conn_idlock);
454 list_del(&conn->id_link);
455 write_unlock(&peer->conn_idlock);
456
457 __RXACCT(atomic_dec(&rxrpc_connection_count));
458 kfree(conn);
459
460 /* if the graveyard is now empty, wake up anyone waiting for that */
461 if (atomic_dec_and_test(&peer->conn_count))
462 wake_up(&peer->conn_gy_waitq);
463
464 _leave(" [destroyed]");
465} /* end rxrpc_conn_do_timeout() */
466
467/*****************************************************************************/
468/*
469 * clear all connection records from a peer endpoint
470 */
471void rxrpc_conn_clearall(struct rxrpc_peer *peer)
472{
473 DECLARE_WAITQUEUE(myself, current);
474
475 struct rxrpc_connection *conn;
476 int err;
477
478 _enter("%p", peer);
479
480 /* there shouldn't be any active conns remaining */
481 if (!list_empty(&peer->conn_active))
482 BUG();
483
484 /* manually timeout all conns in the graveyard */
485 spin_lock(&peer->conn_gylock);
486 while (!list_empty(&peer->conn_graveyard)) {
487 conn = list_entry(peer->conn_graveyard.next,
488 struct rxrpc_connection, link);
489 err = rxrpc_krxtimod_del_timer(&conn->timeout);
490 spin_unlock(&peer->conn_gylock);
491
492 if (err == 0)
493 rxrpc_conn_do_timeout(conn);
494
495 spin_lock(&peer->conn_gylock);
496 }
497 spin_unlock(&peer->conn_gylock);
498
499 /* wait for the the conn graveyard to be completely cleared */
500 set_current_state(TASK_UNINTERRUPTIBLE);
501 add_wait_queue(&peer->conn_gy_waitq, &myself);
502
503 while (atomic_read(&peer->conn_count) != 0) {
504 schedule();
505 set_current_state(TASK_UNINTERRUPTIBLE);
506 }
507
508 remove_wait_queue(&peer->conn_gy_waitq, &myself);
509 set_current_state(TASK_RUNNING);
510
511 _leave("");
512} /* end rxrpc_conn_clearall() */
513
514/*****************************************************************************/
515/*
516 * allocate and prepare a message for sending out through the transport
517 * endpoint
518 */
519int rxrpc_conn_newmsg(struct rxrpc_connection *conn,
520 struct rxrpc_call *call,
521 uint8_t type,
522 int dcount,
523 struct kvec diov[],
524 gfp_t alloc_flags,
525 struct rxrpc_message **_msg)
526{
527 struct rxrpc_message *msg;
528 int loop;
529
530 _enter("%p{%d},%p,%u", conn, ntohs(conn->addr.sin_port), call, type);
531
532 if (dcount > 3) {
533 _leave(" = -EINVAL");
534 return -EINVAL;
535 }
536
537 msg = kzalloc(sizeof(struct rxrpc_message), alloc_flags);
538 if (!msg) {
539 _leave(" = -ENOMEM");
540 return -ENOMEM;
541 }
542
543 atomic_set(&msg->usage, 1);
544
545 INIT_LIST_HEAD(&msg->link);
546
547 msg->state = RXRPC_MSG_PREPARED;
548
549 msg->hdr.epoch = conn->out_epoch;
550 msg->hdr.cid = conn->conn_id | (call ? call->chan_ix : 0);
551 msg->hdr.callNumber = call ? call->call_id : 0;
552 msg->hdr.type = type;
553 msg->hdr.flags = conn->out_clientflag;
554 msg->hdr.securityIndex = conn->security_ix;
555 msg->hdr.serviceId = conn->service_id;
556
557 /* generate sequence numbers for data packets */
558 if (call) {
559 switch (type) {
560 case RXRPC_PACKET_TYPE_DATA:
561 msg->seq = ++call->snd_seq_count;
562 msg->hdr.seq = htonl(msg->seq);
563 break;
564 case RXRPC_PACKET_TYPE_ACK:
565 /* ACK sequence numbers are complicated. The following
566 * may be wrong:
567 * - jumbo packet ACKs should have a seq number
568 * - normal ACKs should not
569 */
570 default:
571 break;
572 }
573 }
574
575 msg->dcount = dcount + 1;
576 msg->dsize = sizeof(msg->hdr);
577 msg->data[0].iov_len = sizeof(msg->hdr);
578 msg->data[0].iov_base = &msg->hdr;
579
580 for (loop=0; loop < dcount; loop++) {
581 msg->dsize += diov[loop].iov_len;
582 msg->data[loop+1].iov_len = diov[loop].iov_len;
583 msg->data[loop+1].iov_base = diov[loop].iov_base;
584 }
585
586 __RXACCT(atomic_inc(&rxrpc_message_count));
587 *_msg = msg;
588 _leave(" = 0 (%p) #%d", msg, atomic_read(&rxrpc_message_count));
589 return 0;
590} /* end rxrpc_conn_newmsg() */
591
592/*****************************************************************************/
593/*
594 * free a message
595 */
596void __rxrpc_put_message(struct rxrpc_message *msg)
597{
598 int loop;
599
600 _enter("%p #%d", msg, atomic_read(&rxrpc_message_count));
601
602 if (msg->pkt)
603 kfree_skb(msg->pkt);
604 rxrpc_put_connection(msg->conn);
605
606 for (loop = 0; loop < 8; loop++)
607 if (test_bit(loop, &msg->dfree))
608 kfree(msg->data[loop].iov_base);
609
610 __RXACCT(atomic_dec(&rxrpc_message_count));
611 kfree(msg);
612
613 _leave("");
614} /* end __rxrpc_put_message() */
615
616/*****************************************************************************/
617/*
618 * send a message out through the transport endpoint
619 */
620int rxrpc_conn_sendmsg(struct rxrpc_connection *conn,
621 struct rxrpc_message *msg)
622{
623 struct msghdr msghdr;
624 int ret;
625
626 _enter("%p{%d}", conn, ntohs(conn->addr.sin_port));
627
628 /* fill in some fields in the header */
629 spin_lock(&conn->lock);
630 msg->hdr.serial = htonl(++conn->serial_counter);
631 msg->rttdone = 0;
632 spin_unlock(&conn->lock);
633
634 /* set up the message to be transmitted */
635 msghdr.msg_name = &conn->addr;
636 msghdr.msg_namelen = sizeof(conn->addr);
637 msghdr.msg_control = NULL;
638 msghdr.msg_controllen = 0;
639 msghdr.msg_flags = MSG_CONFIRM | MSG_DONTWAIT;
640
641 _net("Sending message type %d of %Zd bytes to %08x:%d",
642 msg->hdr.type,
643 msg->dsize,
644 ntohl(conn->addr.sin_addr.s_addr),
645 ntohs(conn->addr.sin_port));
646
647 /* send the message */
648 ret = kernel_sendmsg(conn->trans->socket, &msghdr,
649 msg->data, msg->dcount, msg->dsize);
650 if (ret < 0) {
651 msg->state = RXRPC_MSG_ERROR;
652 } else {
653 msg->state = RXRPC_MSG_SENT;
654 ret = 0;
655
656 spin_lock(&conn->lock);
657 do_gettimeofday(&conn->atime);
658 msg->stamp = conn->atime;
659 spin_unlock(&conn->lock);
660 }
661
662 _leave(" = %d", ret);
663
664 return ret;
665} /* end rxrpc_conn_sendmsg() */
666
667/*****************************************************************************/
668/*
669 * deal with a subsequent call packet
670 */
671int rxrpc_conn_receive_call_packet(struct rxrpc_connection *conn,
672 struct rxrpc_call *call,
673 struct rxrpc_message *msg)
674{
675 struct rxrpc_message *pmsg;
676 struct dst_entry *dst;
677 struct list_head *_p;
678 unsigned cix, seq;
679 int ret = 0;
680
681 _enter("%p,%p,%p", conn, call, msg);
682
683 if (!call) {
684 cix = ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK;
685
686 spin_lock(&conn->lock);
687 call = conn->channels[cix];
688
689 if (!call || call->call_id != msg->hdr.callNumber) {
690 spin_unlock(&conn->lock);
691 rxrpc_trans_immediate_abort(conn->trans, msg, -ENOENT);
692 goto out;
693 }
694 else {
695 rxrpc_get_call(call);
696 spin_unlock(&conn->lock);
697 }
698 }
699 else {
700 rxrpc_get_call(call);
701 }
702
703 _proto("Received packet %%%u [%u] on call %hu:%u:%u",
704 ntohl(msg->hdr.serial),
705 ntohl(msg->hdr.seq),
706 ntohs(msg->hdr.serviceId),
707 ntohl(conn->conn_id),
708 ntohl(call->call_id));
709
710 call->pkt_rcv_count++;
711
712 dst = msg->pkt->dst;
713 if (dst && dst->dev)
714 conn->peer->if_mtu =
715 dst->dev->mtu - dst->dev->hard_header_len;
716
717 /* queue on the call in seq order */
718 rxrpc_get_message(msg);
719 seq = msg->seq;
720
721 spin_lock(&call->lock);
722 list_for_each(_p, &call->rcv_receiveq) {
723 pmsg = list_entry(_p, struct rxrpc_message, link);
724 if (pmsg->seq > seq)
725 break;
726 }
727 list_add_tail(&msg->link, _p);
728
729 /* reset the activity timeout */
730 call->flags |= RXRPC_CALL_RCV_PKT;
731 mod_timer(&call->rcv_timeout,jiffies + rxrpc_call_rcv_timeout * HZ);
732
733 spin_unlock(&call->lock);
734
735 rxrpc_krxiod_queue_call(call);
736
737 rxrpc_put_call(call);
738 out:
739 _leave(" = %d", ret);
740 return ret;
741} /* end rxrpc_conn_receive_call_packet() */
742
743/*****************************************************************************/
744/*
745 * handle an ICMP error being applied to a connection
746 */
747void rxrpc_conn_handle_error(struct rxrpc_connection *conn,
748 int local, int errno)
749{
750 struct rxrpc_call *calls[4];
751 int loop;
752
753 _enter("%p{%d},%d", conn, ntohs(conn->addr.sin_port), errno);
754
755 /* get a ref to all my calls in one go */
756 memset(calls, 0, sizeof(calls));
757 spin_lock(&conn->lock);
758
759 for (loop = 3; loop >= 0; loop--) {
760 if (conn->channels[loop]) {
761 calls[loop] = conn->channels[loop];
762 rxrpc_get_call(calls[loop]);
763 }
764 }
765
766 spin_unlock(&conn->lock);
767
768 /* now kick them all */
769 for (loop = 3; loop >= 0; loop--) {
770 if (calls[loop]) {
771 rxrpc_call_handle_error(calls[loop], local, errno);
772 rxrpc_put_call(calls[loop]);
773 }
774 }
775
776 _leave("");
777} /* end rxrpc_conn_handle_error() */
diff --git a/net/rxrpc/internal.h b/net/rxrpc/internal.h
deleted file mode 100644
index cc0c5795a103..000000000000
--- a/net/rxrpc/internal.h
+++ /dev/null
@@ -1,106 +0,0 @@
1/* internal.h: internal Rx RPC stuff
2 *
3 * Copyright (c) 2002 David Howells (dhowells@redhat.com).
4 */
5
6#ifndef RXRPC_INTERNAL_H
7#define RXRPC_INTERNAL_H
8
9#include <linux/compiler.h>
10#include <linux/kernel.h>
11
12/*
13 * debug accounting
14 */
15#if 1
16#define __RXACCT_DECL(X) X
17#define __RXACCT(X) do { X; } while(0)
18#else
19#define __RXACCT_DECL(X)
20#define __RXACCT(X) do { } while(0)
21#endif
22
23__RXACCT_DECL(extern atomic_t rxrpc_transport_count);
24__RXACCT_DECL(extern atomic_t rxrpc_peer_count);
25__RXACCT_DECL(extern atomic_t rxrpc_connection_count);
26__RXACCT_DECL(extern atomic_t rxrpc_call_count);
27__RXACCT_DECL(extern atomic_t rxrpc_message_count);
28
29/*
30 * debug tracing
31 */
32#define kenter(FMT, a...) printk("==> %s("FMT")\n",__FUNCTION__ , ##a)
33#define kleave(FMT, a...) printk("<== %s()"FMT"\n",__FUNCTION__ , ##a)
34#define kdebug(FMT, a...) printk(" "FMT"\n" , ##a)
35#define kproto(FMT, a...) printk("### "FMT"\n" , ##a)
36#define knet(FMT, a...) printk(" "FMT"\n" , ##a)
37
38#if 0
39#define _enter(FMT, a...) kenter(FMT , ##a)
40#define _leave(FMT, a...) kleave(FMT , ##a)
41#define _debug(FMT, a...) kdebug(FMT , ##a)
42#define _proto(FMT, a...) kproto(FMT , ##a)
43#define _net(FMT, a...) knet(FMT , ##a)
44#else
45#define _enter(FMT, a...) do { if (rxrpc_ktrace) kenter(FMT , ##a); } while(0)
46#define _leave(FMT, a...) do { if (rxrpc_ktrace) kleave(FMT , ##a); } while(0)
47#define _debug(FMT, a...) do { if (rxrpc_kdebug) kdebug(FMT , ##a); } while(0)
48#define _proto(FMT, a...) do { if (rxrpc_kproto) kproto(FMT , ##a); } while(0)
49#define _net(FMT, a...) do { if (rxrpc_knet) knet (FMT , ##a); } while(0)
50#endif
51
52static inline void rxrpc_discard_my_signals(void)
53{
54 while (signal_pending(current)) {
55 siginfo_t sinfo;
56
57 spin_lock_irq(&current->sighand->siglock);
58 dequeue_signal(current, &current->blocked, &sinfo);
59 spin_unlock_irq(&current->sighand->siglock);
60 }
61}
62
63/*
64 * call.c
65 */
66extern struct list_head rxrpc_calls;
67extern struct rw_semaphore rxrpc_calls_sem;
68
69/*
70 * connection.c
71 */
72extern struct list_head rxrpc_conns;
73extern struct rw_semaphore rxrpc_conns_sem;
74extern unsigned long rxrpc_conn_timeout;
75
76extern void rxrpc_conn_clearall(struct rxrpc_peer *peer);
77
78/*
79 * peer.c
80 */
81extern struct list_head rxrpc_peers;
82extern struct rw_semaphore rxrpc_peers_sem;
83extern unsigned long rxrpc_peer_timeout;
84
85extern void rxrpc_peer_calculate_rtt(struct rxrpc_peer *peer,
86 struct rxrpc_message *msg,
87 struct rxrpc_message *resp);
88
89extern void rxrpc_peer_clearall(struct rxrpc_transport *trans);
90
91
92/*
93 * proc.c
94 */
95#ifdef CONFIG_PROC_FS
96extern int rxrpc_proc_init(void);
97extern void rxrpc_proc_cleanup(void);
98#endif
99
100/*
101 * transport.c
102 */
103extern struct list_head rxrpc_proc_transports;
104extern struct rw_semaphore rxrpc_proc_transports_sem;
105
106#endif /* RXRPC_INTERNAL_H */
diff --git a/net/rxrpc/krxiod.c b/net/rxrpc/krxiod.c
deleted file mode 100644
index bbbcd6c24048..000000000000
--- a/net/rxrpc/krxiod.c
+++ /dev/null
@@ -1,262 +0,0 @@
1/* krxiod.c: Rx I/O daemon
2 *
3 * Copyright (C) 2002 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/sched.h>
13#include <linux/completion.h>
14#include <linux/spinlock.h>
15#include <linux/init.h>
16#include <linux/freezer.h>
17#include <rxrpc/krxiod.h>
18#include <rxrpc/transport.h>
19#include <rxrpc/peer.h>
20#include <rxrpc/call.h>
21#include "internal.h"
22
23static DECLARE_WAIT_QUEUE_HEAD(rxrpc_krxiod_sleepq);
24static DECLARE_COMPLETION(rxrpc_krxiod_dead);
25
26static atomic_t rxrpc_krxiod_qcount = ATOMIC_INIT(0);
27
28static LIST_HEAD(rxrpc_krxiod_transportq);
29static DEFINE_SPINLOCK(rxrpc_krxiod_transportq_lock);
30
31static LIST_HEAD(rxrpc_krxiod_callq);
32static DEFINE_SPINLOCK(rxrpc_krxiod_callq_lock);
33
34static volatile int rxrpc_krxiod_die;
35
36/*****************************************************************************/
37/*
38 * Rx I/O daemon
39 */
40static int rxrpc_krxiod(void *arg)
41{
42 DECLARE_WAITQUEUE(krxiod,current);
43
44 printk("Started krxiod %d\n",current->pid);
45
46 daemonize("krxiod");
47
48 /* loop around waiting for work to do */
49 do {
50 /* wait for work or to be told to exit */
51 _debug("### Begin Wait");
52 if (!atomic_read(&rxrpc_krxiod_qcount)) {
53 set_current_state(TASK_INTERRUPTIBLE);
54
55 add_wait_queue(&rxrpc_krxiod_sleepq, &krxiod);
56
57 for (;;) {
58 set_current_state(TASK_INTERRUPTIBLE);
59 if (atomic_read(&rxrpc_krxiod_qcount) ||
60 rxrpc_krxiod_die ||
61 signal_pending(current))
62 break;
63
64 schedule();
65 }
66
67 remove_wait_queue(&rxrpc_krxiod_sleepq, &krxiod);
68 set_current_state(TASK_RUNNING);
69 }
70 _debug("### End Wait");
71
72 /* do work if been given some to do */
73 _debug("### Begin Work");
74
75 /* see if there's a transport in need of attention */
76 if (!list_empty(&rxrpc_krxiod_transportq)) {
77 struct rxrpc_transport *trans = NULL;
78
79 spin_lock_irq(&rxrpc_krxiod_transportq_lock);
80
81 if (!list_empty(&rxrpc_krxiod_transportq)) {
82 trans = list_entry(
83 rxrpc_krxiod_transportq.next,
84 struct rxrpc_transport,
85 krxiodq_link);
86
87 list_del_init(&trans->krxiodq_link);
88 atomic_dec(&rxrpc_krxiod_qcount);
89
90 /* make sure it hasn't gone away and doesn't go
91 * away */
92 if (atomic_read(&trans->usage)>0)
93 rxrpc_get_transport(trans);
94 else
95 trans = NULL;
96 }
97
98 spin_unlock_irq(&rxrpc_krxiod_transportq_lock);
99
100 if (trans) {
101 rxrpc_trans_receive_packet(trans);
102 rxrpc_put_transport(trans);
103 }
104 }
105
106 /* see if there's a call in need of attention */
107 if (!list_empty(&rxrpc_krxiod_callq)) {
108 struct rxrpc_call *call = NULL;
109
110 spin_lock_irq(&rxrpc_krxiod_callq_lock);
111
112 if (!list_empty(&rxrpc_krxiod_callq)) {
113 call = list_entry(rxrpc_krxiod_callq.next,
114 struct rxrpc_call,
115 rcv_krxiodq_lk);
116 list_del_init(&call->rcv_krxiodq_lk);
117 atomic_dec(&rxrpc_krxiod_qcount);
118
119 /* make sure it hasn't gone away and doesn't go
120 * away */
121 if (atomic_read(&call->usage) > 0) {
122 _debug("@@@ KRXIOD"
123 " Begin Attend Call %p", call);
124 rxrpc_get_call(call);
125 }
126 else {
127 call = NULL;
128 }
129 }
130
131 spin_unlock_irq(&rxrpc_krxiod_callq_lock);
132
133 if (call) {
134 rxrpc_call_do_stuff(call);
135 rxrpc_put_call(call);
136 _debug("@@@ KRXIOD End Attend Call %p", call);
137 }
138 }
139
140 _debug("### End Work");
141
142 try_to_freeze();
143
144 /* discard pending signals */
145 rxrpc_discard_my_signals();
146
147 } while (!rxrpc_krxiod_die);
148
149 /* and that's all */
150 complete_and_exit(&rxrpc_krxiod_dead, 0);
151
152} /* end rxrpc_krxiod() */
153
154/*****************************************************************************/
155/*
156 * start up a krxiod daemon
157 */
158int __init rxrpc_krxiod_init(void)
159{
160 return kernel_thread(rxrpc_krxiod, NULL, 0);
161
162} /* end rxrpc_krxiod_init() */
163
164/*****************************************************************************/
165/*
166 * kill the krxiod daemon and wait for it to complete
167 */
168void rxrpc_krxiod_kill(void)
169{
170 rxrpc_krxiod_die = 1;
171 wake_up_all(&rxrpc_krxiod_sleepq);
172 wait_for_completion(&rxrpc_krxiod_dead);
173
174} /* end rxrpc_krxiod_kill() */
175
176/*****************************************************************************/
177/*
178 * queue a transport for attention by krxiod
179 */
180void rxrpc_krxiod_queue_transport(struct rxrpc_transport *trans)
181{
182 unsigned long flags;
183
184 _enter("");
185
186 if (list_empty(&trans->krxiodq_link)) {
187 spin_lock_irqsave(&rxrpc_krxiod_transportq_lock, flags);
188
189 if (list_empty(&trans->krxiodq_link)) {
190 if (atomic_read(&trans->usage) > 0) {
191 list_add_tail(&trans->krxiodq_link,
192 &rxrpc_krxiod_transportq);
193 atomic_inc(&rxrpc_krxiod_qcount);
194 }
195 }
196
197 spin_unlock_irqrestore(&rxrpc_krxiod_transportq_lock, flags);
198 wake_up_all(&rxrpc_krxiod_sleepq);
199 }
200
201 _leave("");
202
203} /* end rxrpc_krxiod_queue_transport() */
204
205/*****************************************************************************/
206/*
207 * dequeue a transport from krxiod's attention queue
208 */
209void rxrpc_krxiod_dequeue_transport(struct rxrpc_transport *trans)
210{
211 unsigned long flags;
212
213 _enter("");
214
215 spin_lock_irqsave(&rxrpc_krxiod_transportq_lock, flags);
216 if (!list_empty(&trans->krxiodq_link)) {
217 list_del_init(&trans->krxiodq_link);
218 atomic_dec(&rxrpc_krxiod_qcount);
219 }
220 spin_unlock_irqrestore(&rxrpc_krxiod_transportq_lock, flags);
221
222 _leave("");
223
224} /* end rxrpc_krxiod_dequeue_transport() */
225
226/*****************************************************************************/
227/*
228 * queue a call for attention by krxiod
229 */
230void rxrpc_krxiod_queue_call(struct rxrpc_call *call)
231{
232 unsigned long flags;
233
234 if (list_empty(&call->rcv_krxiodq_lk)) {
235 spin_lock_irqsave(&rxrpc_krxiod_callq_lock, flags);
236 if (atomic_read(&call->usage) > 0) {
237 list_add_tail(&call->rcv_krxiodq_lk,
238 &rxrpc_krxiod_callq);
239 atomic_inc(&rxrpc_krxiod_qcount);
240 }
241 spin_unlock_irqrestore(&rxrpc_krxiod_callq_lock, flags);
242 }
243 wake_up_all(&rxrpc_krxiod_sleepq);
244
245} /* end rxrpc_krxiod_queue_call() */
246
247/*****************************************************************************/
248/*
249 * dequeue a call from krxiod's attention queue
250 */
251void rxrpc_krxiod_dequeue_call(struct rxrpc_call *call)
252{
253 unsigned long flags;
254
255 spin_lock_irqsave(&rxrpc_krxiod_callq_lock, flags);
256 if (!list_empty(&call->rcv_krxiodq_lk)) {
257 list_del_init(&call->rcv_krxiodq_lk);
258 atomic_dec(&rxrpc_krxiod_qcount);
259 }
260 spin_unlock_irqrestore(&rxrpc_krxiod_callq_lock, flags);
261
262} /* end rxrpc_krxiod_dequeue_call() */
diff --git a/net/rxrpc/krxsecd.c b/net/rxrpc/krxsecd.c
deleted file mode 100644
index 9a1e7f5e034c..000000000000
--- a/net/rxrpc/krxsecd.c
+++ /dev/null
@@ -1,270 +0,0 @@
1/* krxsecd.c: Rx security daemon
2 *
3 * Copyright (C) 2002 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 * This daemon deals with:
12 * - consulting the application as to whether inbound peers and calls should be authorised
13 * - generating security challenges for inbound connections
14 * - responding to security challenges on outbound connections
15 */
16
17#include <linux/module.h>
18#include <linux/sched.h>
19#include <linux/completion.h>
20#include <linux/spinlock.h>
21#include <linux/init.h>
22#include <rxrpc/krxsecd.h>
23#include <rxrpc/transport.h>
24#include <rxrpc/connection.h>
25#include <rxrpc/message.h>
26#include <rxrpc/peer.h>
27#include <rxrpc/call.h>
28#include <linux/udp.h>
29#include <linux/ip.h>
30#include <linux/freezer.h>
31#include <net/sock.h>
32#include "internal.h"
33
34static DECLARE_WAIT_QUEUE_HEAD(rxrpc_krxsecd_sleepq);
35static DECLARE_COMPLETION(rxrpc_krxsecd_dead);
36static volatile int rxrpc_krxsecd_die;
37
38static atomic_t rxrpc_krxsecd_qcount;
39
40/* queue of unprocessed inbound messages with seqno #1 and
41 * RXRPC_CLIENT_INITIATED flag set */
42static LIST_HEAD(rxrpc_krxsecd_initmsgq);
43static DEFINE_SPINLOCK(rxrpc_krxsecd_initmsgq_lock);
44
45static void rxrpc_krxsecd_process_incoming_call(struct rxrpc_message *msg);
46
47/*****************************************************************************/
48/*
49 * Rx security daemon
50 */
51static int rxrpc_krxsecd(void *arg)
52{
53 DECLARE_WAITQUEUE(krxsecd, current);
54
55 int die;
56
57 printk("Started krxsecd %d\n", current->pid);
58
59 daemonize("krxsecd");
60
61 /* loop around waiting for work to do */
62 do {
63 /* wait for work or to be told to exit */
64 _debug("### Begin Wait");
65 if (!atomic_read(&rxrpc_krxsecd_qcount)) {
66 set_current_state(TASK_INTERRUPTIBLE);
67
68 add_wait_queue(&rxrpc_krxsecd_sleepq, &krxsecd);
69
70 for (;;) {
71 set_current_state(TASK_INTERRUPTIBLE);
72 if (atomic_read(&rxrpc_krxsecd_qcount) ||
73 rxrpc_krxsecd_die ||
74 signal_pending(current))
75 break;
76
77 schedule();
78 }
79
80 remove_wait_queue(&rxrpc_krxsecd_sleepq, &krxsecd);
81 set_current_state(TASK_RUNNING);
82 }
83 die = rxrpc_krxsecd_die;
84 _debug("### End Wait");
85
86 /* see if there're incoming calls in need of authenticating */
87 _debug("### Begin Inbound Calls");
88
89 if (!list_empty(&rxrpc_krxsecd_initmsgq)) {
90 struct rxrpc_message *msg = NULL;
91
92 spin_lock(&rxrpc_krxsecd_initmsgq_lock);
93
94 if (!list_empty(&rxrpc_krxsecd_initmsgq)) {
95 msg = list_entry(rxrpc_krxsecd_initmsgq.next,
96 struct rxrpc_message, link);
97 list_del_init(&msg->link);
98 atomic_dec(&rxrpc_krxsecd_qcount);
99 }
100
101 spin_unlock(&rxrpc_krxsecd_initmsgq_lock);
102
103 if (msg) {
104 rxrpc_krxsecd_process_incoming_call(msg);
105 rxrpc_put_message(msg);
106 }
107 }
108
109 _debug("### End Inbound Calls");
110
111 try_to_freeze();
112
113 /* discard pending signals */
114 rxrpc_discard_my_signals();
115
116 } while (!die);
117
118 /* and that's all */
119 complete_and_exit(&rxrpc_krxsecd_dead, 0);
120
121} /* end rxrpc_krxsecd() */
122
123/*****************************************************************************/
124/*
125 * start up a krxsecd daemon
126 */
127int __init rxrpc_krxsecd_init(void)
128{
129 return kernel_thread(rxrpc_krxsecd, NULL, 0);
130
131} /* end rxrpc_krxsecd_init() */
132
133/*****************************************************************************/
134/*
135 * kill the krxsecd daemon and wait for it to complete
136 */
137void rxrpc_krxsecd_kill(void)
138{
139 rxrpc_krxsecd_die = 1;
140 wake_up_all(&rxrpc_krxsecd_sleepq);
141 wait_for_completion(&rxrpc_krxsecd_dead);
142
143} /* end rxrpc_krxsecd_kill() */
144
145/*****************************************************************************/
146/*
147 * clear all pending incoming calls for the specified transport
148 */
149void rxrpc_krxsecd_clear_transport(struct rxrpc_transport *trans)
150{
151 LIST_HEAD(tmp);
152
153 struct rxrpc_message *msg;
154 struct list_head *_p, *_n;
155
156 _enter("%p",trans);
157
158 /* move all the messages for this transport onto a temp list */
159 spin_lock(&rxrpc_krxsecd_initmsgq_lock);
160
161 list_for_each_safe(_p, _n, &rxrpc_krxsecd_initmsgq) {
162 msg = list_entry(_p, struct rxrpc_message, link);
163 if (msg->trans == trans) {
164 list_move_tail(&msg->link, &tmp);
165 atomic_dec(&rxrpc_krxsecd_qcount);
166 }
167 }
168
169 spin_unlock(&rxrpc_krxsecd_initmsgq_lock);
170
171 /* zap all messages on the temp list */
172 while (!list_empty(&tmp)) {
173 msg = list_entry(tmp.next, struct rxrpc_message, link);
174 list_del_init(&msg->link);
175 rxrpc_put_message(msg);
176 }
177
178 _leave("");
179} /* end rxrpc_krxsecd_clear_transport() */
180
181/*****************************************************************************/
182/*
183 * queue a message on the incoming calls list
184 */
185void rxrpc_krxsecd_queue_incoming_call(struct rxrpc_message *msg)
186{
187 _enter("%p", msg);
188
189 /* queue for processing by krxsecd */
190 spin_lock(&rxrpc_krxsecd_initmsgq_lock);
191
192 if (!rxrpc_krxsecd_die) {
193 rxrpc_get_message(msg);
194 list_add_tail(&msg->link, &rxrpc_krxsecd_initmsgq);
195 atomic_inc(&rxrpc_krxsecd_qcount);
196 }
197
198 spin_unlock(&rxrpc_krxsecd_initmsgq_lock);
199
200 wake_up(&rxrpc_krxsecd_sleepq);
201
202 _leave("");
203} /* end rxrpc_krxsecd_queue_incoming_call() */
204
205/*****************************************************************************/
206/*
207 * process the initial message of an incoming call
208 */
209void rxrpc_krxsecd_process_incoming_call(struct rxrpc_message *msg)
210{
211 struct rxrpc_transport *trans = msg->trans;
212 struct rxrpc_service *srv;
213 struct rxrpc_call *call;
214 struct list_head *_p;
215 unsigned short sid;
216 int ret;
217
218 _enter("%p{tr=%p}", msg, trans);
219
220 ret = rxrpc_incoming_call(msg->conn, msg, &call);
221 if (ret < 0)
222 goto out;
223
224 /* find the matching service on the transport */
225 sid = ntohs(msg->hdr.serviceId);
226 srv = NULL;
227
228 spin_lock(&trans->lock);
229 list_for_each(_p, &trans->services) {
230 srv = list_entry(_p, struct rxrpc_service, link);
231 if (srv->service_id == sid && try_module_get(srv->owner)) {
232 /* found a match (made sure it won't vanish) */
233 _debug("found service '%s'", srv->name);
234 call->owner = srv->owner;
235 break;
236 }
237 }
238 spin_unlock(&trans->lock);
239
240 /* report the new connection
241 * - the func must inc the call's usage count to keep it
242 */
243 ret = -ENOENT;
244 if (_p != &trans->services) {
245 /* attempt to accept the call */
246 call->conn->service = srv;
247 call->app_attn_func = srv->attn_func;
248 call->app_error_func = srv->error_func;
249 call->app_aemap_func = srv->aemap_func;
250
251 ret = srv->new_call(call);
252
253 /* send an abort if an error occurred */
254 if (ret < 0) {
255 rxrpc_call_abort(call, ret);
256 }
257 else {
258 /* formally receive and ACK the new packet */
259 ret = rxrpc_conn_receive_call_packet(call->conn,
260 call, msg);
261 }
262 }
263
264 rxrpc_put_call(call);
265 out:
266 if (ret < 0)
267 rxrpc_trans_immediate_abort(trans, msg, ret);
268
269 _leave(" (%d)", ret);
270} /* end rxrpc_krxsecd_process_incoming_call() */
diff --git a/net/rxrpc/krxtimod.c b/net/rxrpc/krxtimod.c
deleted file mode 100644
index 9a9b6132dba4..000000000000
--- a/net/rxrpc/krxtimod.c
+++ /dev/null
@@ -1,204 +0,0 @@
1/* krxtimod.c: RXRPC timeout daemon
2 *
3 * Copyright (C) 2002 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/init.h>
14#include <linux/sched.h>
15#include <linux/completion.h>
16#include <linux/freezer.h>
17#include <rxrpc/rxrpc.h>
18#include <rxrpc/krxtimod.h>
19#include <asm/errno.h>
20#include "internal.h"
21
22static DECLARE_COMPLETION(krxtimod_alive);
23static DECLARE_COMPLETION(krxtimod_dead);
24static DECLARE_WAIT_QUEUE_HEAD(krxtimod_sleepq);
25static int krxtimod_die;
26
27static LIST_HEAD(krxtimod_list);
28static DEFINE_SPINLOCK(krxtimod_lock);
29
30static int krxtimod(void *arg);
31
32/*****************************************************************************/
33/*
34 * start the timeout daemon
35 */
36int rxrpc_krxtimod_start(void)
37{
38 int ret;
39
40 ret = kernel_thread(krxtimod, NULL, 0);
41 if (ret < 0)
42 return ret;
43
44 wait_for_completion(&krxtimod_alive);
45
46 return ret;
47} /* end rxrpc_krxtimod_start() */
48
49/*****************************************************************************/
50/*
51 * stop the timeout daemon
52 */
53void rxrpc_krxtimod_kill(void)
54{
55 /* get rid of my daemon */
56 krxtimod_die = 1;
57 wake_up(&krxtimod_sleepq);
58 wait_for_completion(&krxtimod_dead);
59
60} /* end rxrpc_krxtimod_kill() */
61
62/*****************************************************************************/
63/*
64 * timeout processing daemon
65 */
66static int krxtimod(void *arg)
67{
68 DECLARE_WAITQUEUE(myself, current);
69
70 rxrpc_timer_t *timer;
71
72 printk("Started krxtimod %d\n", current->pid);
73
74 daemonize("krxtimod");
75
76 complete(&krxtimod_alive);
77
78 /* loop around looking for things to attend to */
79 loop:
80 set_current_state(TASK_INTERRUPTIBLE);
81 add_wait_queue(&krxtimod_sleepq, &myself);
82
83 for (;;) {
84 unsigned long jif;
85 long timeout;
86
87 /* deal with the server being asked to die */
88 if (krxtimod_die) {
89 remove_wait_queue(&krxtimod_sleepq, &myself);
90 _leave("");
91 complete_and_exit(&krxtimod_dead, 0);
92 }
93
94 try_to_freeze();
95
96 /* discard pending signals */
97 rxrpc_discard_my_signals();
98
99 /* work out the time to elapse before the next event */
100 spin_lock(&krxtimod_lock);
101 if (list_empty(&krxtimod_list)) {
102 timeout = MAX_SCHEDULE_TIMEOUT;
103 }
104 else {
105 timer = list_entry(krxtimod_list.next,
106 rxrpc_timer_t, link);
107 timeout = timer->timo_jif;
108 jif = jiffies;
109
110 if (time_before_eq((unsigned long) timeout, jif))
111 goto immediate;
112
113 else {
114 timeout = (long) timeout - (long) jiffies;
115 }
116 }
117 spin_unlock(&krxtimod_lock);
118
119 schedule_timeout(timeout);
120
121 set_current_state(TASK_INTERRUPTIBLE);
122 }
123
124 /* the thing on the front of the queue needs processing
125 * - we come here with the lock held and timer pointing to the expired
126 * entry
127 */
128 immediate:
129 remove_wait_queue(&krxtimod_sleepq, &myself);
130 set_current_state(TASK_RUNNING);
131
132 _debug("@@@ Begin Timeout of %p", timer);
133
134 /* dequeue the timer */
135 list_del_init(&timer->link);
136 spin_unlock(&krxtimod_lock);
137
138 /* call the timeout function */
139 timer->ops->timed_out(timer);
140
141 _debug("@@@ End Timeout");
142 goto loop;
143
144} /* end krxtimod() */
145
146/*****************************************************************************/
147/*
148 * (re-)queue a timer
149 */
150void rxrpc_krxtimod_add_timer(rxrpc_timer_t *timer, unsigned long timeout)
151{
152 struct list_head *_p;
153 rxrpc_timer_t *ptimer;
154
155 _enter("%p,%lu", timer, timeout);
156
157 spin_lock(&krxtimod_lock);
158
159 list_del(&timer->link);
160
161 /* the timer was deferred or reset - put it back in the queue at the
162 * right place */
163 timer->timo_jif = jiffies + timeout;
164
165 list_for_each(_p, &krxtimod_list) {
166 ptimer = list_entry(_p, rxrpc_timer_t, link);
167 if (time_before(timer->timo_jif, ptimer->timo_jif))
168 break;
169 }
170
171 list_add_tail(&timer->link, _p); /* insert before stopping point */
172
173 spin_unlock(&krxtimod_lock);
174
175 wake_up(&krxtimod_sleepq);
176
177 _leave("");
178} /* end rxrpc_krxtimod_add_timer() */
179
180/*****************************************************************************/
181/*
182 * dequeue a timer
183 * - returns 0 if the timer was deleted or -ENOENT if it wasn't queued
184 */
185int rxrpc_krxtimod_del_timer(rxrpc_timer_t *timer)
186{
187 int ret = 0;
188
189 _enter("%p", timer);
190
191 spin_lock(&krxtimod_lock);
192
193 if (list_empty(&timer->link))
194 ret = -ENOENT;
195 else
196 list_del_init(&timer->link);
197
198 spin_unlock(&krxtimod_lock);
199
200 wake_up(&krxtimod_sleepq);
201
202 _leave(" = %d", ret);
203 return ret;
204} /* end rxrpc_krxtimod_del_timer() */
diff --git a/net/rxrpc/main.c b/net/rxrpc/main.c
deleted file mode 100644
index cead31b5bdf5..000000000000
--- a/net/rxrpc/main.c
+++ /dev/null
@@ -1,180 +0,0 @@
1/* main.c: Rx RPC interface
2 *
3 * Copyright (C) 2002 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/init.h>
14#include <linux/sched.h>
15#include <rxrpc/rxrpc.h>
16#include <rxrpc/krxiod.h>
17#include <rxrpc/krxsecd.h>
18#include <rxrpc/krxtimod.h>
19#include <rxrpc/transport.h>
20#include <rxrpc/connection.h>
21#include <rxrpc/call.h>
22#include <rxrpc/message.h>
23#include "internal.h"
24
25MODULE_DESCRIPTION("Rx RPC implementation");
26MODULE_AUTHOR("Red Hat, Inc.");
27MODULE_LICENSE("GPL");
28
29__be32 rxrpc_epoch;
30
31/*****************************************************************************/
32/*
33 * initialise the Rx module
34 */
35static int __init rxrpc_initialise(void)
36{
37 int ret;
38
39 /* my epoch value */
40 rxrpc_epoch = htonl(get_seconds());
41
42 /* register the /proc interface */
43#ifdef CONFIG_PROC_FS
44 ret = rxrpc_proc_init();
45 if (ret<0)
46 return ret;
47#endif
48
49 /* register the sysctl files */
50#ifdef CONFIG_SYSCTL
51 ret = rxrpc_sysctl_init();
52 if (ret<0)
53 goto error_proc;
54#endif
55
56 /* start the krxtimod daemon */
57 ret = rxrpc_krxtimod_start();
58 if (ret<0)
59 goto error_sysctl;
60
61 /* start the krxiod daemon */
62 ret = rxrpc_krxiod_init();
63 if (ret<0)
64 goto error_krxtimod;
65
66 /* start the krxsecd daemon */
67 ret = rxrpc_krxsecd_init();
68 if (ret<0)
69 goto error_krxiod;
70
71 kdebug("\n\n");
72
73 return 0;
74
75 error_krxiod:
76 rxrpc_krxiod_kill();
77 error_krxtimod:
78 rxrpc_krxtimod_kill();
79 error_sysctl:
80#ifdef CONFIG_SYSCTL
81 rxrpc_sysctl_cleanup();
82 error_proc:
83#endif
84#ifdef CONFIG_PROC_FS
85 rxrpc_proc_cleanup();
86#endif
87 return ret;
88} /* end rxrpc_initialise() */
89
90module_init(rxrpc_initialise);
91
92/*****************************************************************************/
93/*
94 * clean up the Rx module
95 */
96static void __exit rxrpc_cleanup(void)
97{
98 kenter("");
99
100 __RXACCT(printk("Outstanding Messages : %d\n",
101 atomic_read(&rxrpc_message_count)));
102 __RXACCT(printk("Outstanding Calls : %d\n",
103 atomic_read(&rxrpc_call_count)));
104 __RXACCT(printk("Outstanding Connections: %d\n",
105 atomic_read(&rxrpc_connection_count)));
106 __RXACCT(printk("Outstanding Peers : %d\n",
107 atomic_read(&rxrpc_peer_count)));
108 __RXACCT(printk("Outstanding Transports : %d\n",
109 atomic_read(&rxrpc_transport_count)));
110
111 rxrpc_krxsecd_kill();
112 rxrpc_krxiod_kill();
113 rxrpc_krxtimod_kill();
114#ifdef CONFIG_SYSCTL
115 rxrpc_sysctl_cleanup();
116#endif
117#ifdef CONFIG_PROC_FS
118 rxrpc_proc_cleanup();
119#endif
120
121 __RXACCT(printk("Outstanding Messages : %d\n",
122 atomic_read(&rxrpc_message_count)));
123 __RXACCT(printk("Outstanding Calls : %d\n",
124 atomic_read(&rxrpc_call_count)));
125 __RXACCT(printk("Outstanding Connections: %d\n",
126 atomic_read(&rxrpc_connection_count)));
127 __RXACCT(printk("Outstanding Peers : %d\n",
128 atomic_read(&rxrpc_peer_count)));
129 __RXACCT(printk("Outstanding Transports : %d\n",
130 atomic_read(&rxrpc_transport_count)));
131
132 kleave("");
133} /* end rxrpc_cleanup() */
134
135module_exit(rxrpc_cleanup);
136
137/*****************************************************************************/
138/*
139 * clear the dead space between task_struct and kernel stack
140 * - called by supplying -finstrument-functions to gcc
141 */
142#if 0
143void __cyg_profile_func_enter (void *this_fn, void *call_site)
144__attribute__((no_instrument_function));
145
146void __cyg_profile_func_enter (void *this_fn, void *call_site)
147{
148 asm volatile(" movl %%esp,%%edi \n"
149 " andl %0,%%edi \n"
150 " addl %1,%%edi \n"
151 " movl %%esp,%%ecx \n"
152 " subl %%edi,%%ecx \n"
153 " shrl $2,%%ecx \n"
154 " movl $0xedededed,%%eax \n"
155 " rep stosl \n"
156 :
157 : "i"(~(THREAD_SIZE-1)), "i"(sizeof(struct thread_info))
158 : "eax", "ecx", "edi", "memory", "cc"
159 );
160}
161
162void __cyg_profile_func_exit(void *this_fn, void *call_site)
163__attribute__((no_instrument_function));
164
165void __cyg_profile_func_exit(void *this_fn, void *call_site)
166{
167 asm volatile(" movl %%esp,%%edi \n"
168 " andl %0,%%edi \n"
169 " addl %1,%%edi \n"
170 " movl %%esp,%%ecx \n"
171 " subl %%edi,%%ecx \n"
172 " shrl $2,%%ecx \n"
173 " movl $0xdadadada,%%eax \n"
174 " rep stosl \n"
175 :
176 : "i"(~(THREAD_SIZE-1)), "i"(sizeof(struct thread_info))
177 : "eax", "ecx", "edi", "memory", "cc"
178 );
179}
180#endif
diff --git a/net/rxrpc/peer.c b/net/rxrpc/peer.c
deleted file mode 100644
index 8a275157a3bb..000000000000
--- a/net/rxrpc/peer.c
+++ /dev/null
@@ -1,398 +0,0 @@
1/* peer.c: Rx RPC peer management
2 *
3 * Copyright (C) 2002 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/sched.h>
13#include <linux/slab.h>
14#include <linux/module.h>
15#include <rxrpc/rxrpc.h>
16#include <rxrpc/transport.h>
17#include <rxrpc/peer.h>
18#include <rxrpc/connection.h>
19#include <rxrpc/call.h>
20#include <rxrpc/message.h>
21#include <linux/udp.h>
22#include <linux/ip.h>
23#include <net/sock.h>
24#include <asm/uaccess.h>
25#include <asm/div64.h>
26#include "internal.h"
27
28__RXACCT_DECL(atomic_t rxrpc_peer_count);
29LIST_HEAD(rxrpc_peers);
30DECLARE_RWSEM(rxrpc_peers_sem);
31unsigned long rxrpc_peer_timeout = 12 * 60 * 60;
32
33static void rxrpc_peer_do_timeout(struct rxrpc_peer *peer);
34
35static void __rxrpc_peer_timeout(rxrpc_timer_t *timer)
36{
37 struct rxrpc_peer *peer =
38 list_entry(timer, struct rxrpc_peer, timeout);
39
40 _debug("Rx PEER TIMEOUT [%p{u=%d}]", peer, atomic_read(&peer->usage));
41
42 rxrpc_peer_do_timeout(peer);
43}
44
45static const struct rxrpc_timer_ops rxrpc_peer_timer_ops = {
46 .timed_out = __rxrpc_peer_timeout,
47};
48
49/*****************************************************************************/
50/*
51 * create a peer record
52 */
53static int __rxrpc_create_peer(struct rxrpc_transport *trans, __be32 addr,
54 struct rxrpc_peer **_peer)
55{
56 struct rxrpc_peer *peer;
57
58 _enter("%p,%08x", trans, ntohl(addr));
59
60 /* allocate and initialise a peer record */
61 peer = kzalloc(sizeof(struct rxrpc_peer), GFP_KERNEL);
62 if (!peer) {
63 _leave(" = -ENOMEM");
64 return -ENOMEM;
65 }
66
67 atomic_set(&peer->usage, 1);
68
69 INIT_LIST_HEAD(&peer->link);
70 INIT_LIST_HEAD(&peer->proc_link);
71 INIT_LIST_HEAD(&peer->conn_idlist);
72 INIT_LIST_HEAD(&peer->conn_active);
73 INIT_LIST_HEAD(&peer->conn_graveyard);
74 spin_lock_init(&peer->conn_gylock);
75 init_waitqueue_head(&peer->conn_gy_waitq);
76 rwlock_init(&peer->conn_idlock);
77 rwlock_init(&peer->conn_lock);
78 atomic_set(&peer->conn_count, 0);
79 spin_lock_init(&peer->lock);
80 rxrpc_timer_init(&peer->timeout, &rxrpc_peer_timer_ops);
81
82 peer->addr.s_addr = addr;
83
84 peer->trans = trans;
85 peer->ops = trans->peer_ops;
86
87 __RXACCT(atomic_inc(&rxrpc_peer_count));
88 *_peer = peer;
89 _leave(" = 0 (%p)", peer);
90
91 return 0;
92} /* end __rxrpc_create_peer() */
93
94/*****************************************************************************/
95/*
96 * find a peer record on the specified transport
97 * - returns (if successful) with peer record usage incremented
98 * - resurrects it from the graveyard if found there
99 */
100int rxrpc_peer_lookup(struct rxrpc_transport *trans, __be32 addr,
101 struct rxrpc_peer **_peer)
102{
103 struct rxrpc_peer *peer, *candidate = NULL;
104 struct list_head *_p;
105 int ret;
106
107 _enter("%p{%hu},%08x", trans, trans->port, ntohl(addr));
108
109 /* [common case] search the transport's active list first */
110 read_lock(&trans->peer_lock);
111 list_for_each(_p, &trans->peer_active) {
112 peer = list_entry(_p, struct rxrpc_peer, link);
113 if (peer->addr.s_addr == addr)
114 goto found_active;
115 }
116 read_unlock(&trans->peer_lock);
117
118 /* [uncommon case] not active - create a candidate for a new record */
119 ret = __rxrpc_create_peer(trans, addr, &candidate);
120 if (ret < 0) {
121 _leave(" = %d", ret);
122 return ret;
123 }
124
125 /* search the active list again, just in case it appeared whilst we
126 * were busy */
127 write_lock(&trans->peer_lock);
128 list_for_each(_p, &trans->peer_active) {
129 peer = list_entry(_p, struct rxrpc_peer, link);
130 if (peer->addr.s_addr == addr)
131 goto found_active_second_chance;
132 }
133
134 /* search the transport's graveyard list */
135 spin_lock(&trans->peer_gylock);
136 list_for_each(_p, &trans->peer_graveyard) {
137 peer = list_entry(_p, struct rxrpc_peer, link);
138 if (peer->addr.s_addr == addr)
139 goto found_in_graveyard;
140 }
141 spin_unlock(&trans->peer_gylock);
142
143 /* we can now add the new candidate to the list
144 * - tell the application layer that this peer has been added
145 */
146 rxrpc_get_transport(trans);
147 peer = candidate;
148 candidate = NULL;
149
150 if (peer->ops && peer->ops->adding) {
151 ret = peer->ops->adding(peer);
152 if (ret < 0) {
153 write_unlock(&trans->peer_lock);
154 __RXACCT(atomic_dec(&rxrpc_peer_count));
155 kfree(peer);
156 rxrpc_put_transport(trans);
157 _leave(" = %d", ret);
158 return ret;
159 }
160 }
161
162 atomic_inc(&trans->peer_count);
163
164 make_active:
165 list_add_tail(&peer->link, &trans->peer_active);
166
167 success_uwfree:
168 write_unlock(&trans->peer_lock);
169
170 if (candidate) {
171 __RXACCT(atomic_dec(&rxrpc_peer_count));
172 kfree(candidate);
173 }
174
175 if (list_empty(&peer->proc_link)) {
176 down_write(&rxrpc_peers_sem);
177 list_add_tail(&peer->proc_link, &rxrpc_peers);
178 up_write(&rxrpc_peers_sem);
179 }
180
181 success:
182 *_peer = peer;
183
184 _leave(" = 0 (%p{u=%d cc=%d})",
185 peer,
186 atomic_read(&peer->usage),
187 atomic_read(&peer->conn_count));
188 return 0;
189
190 /* handle the peer being found in the active list straight off */
191 found_active:
192 rxrpc_get_peer(peer);
193 read_unlock(&trans->peer_lock);
194 goto success;
195
196 /* handle resurrecting a peer from the graveyard */
197 found_in_graveyard:
198 rxrpc_get_peer(peer);
199 rxrpc_get_transport(peer->trans);
200 rxrpc_krxtimod_del_timer(&peer->timeout);
201 list_del_init(&peer->link);
202 spin_unlock(&trans->peer_gylock);
203 goto make_active;
204
205 /* handle finding the peer on the second time through the active
206 * list */
207 found_active_second_chance:
208 rxrpc_get_peer(peer);
209 goto success_uwfree;
210
211} /* end rxrpc_peer_lookup() */
212
213/*****************************************************************************/
214/*
215 * finish with a peer record
216 * - it gets sent to the graveyard from where it can be resurrected or timed
217 * out
218 */
219void rxrpc_put_peer(struct rxrpc_peer *peer)
220{
221 struct rxrpc_transport *trans = peer->trans;
222
223 _enter("%p{cc=%d a=%08x}",
224 peer,
225 atomic_read(&peer->conn_count),
226 ntohl(peer->addr.s_addr));
227
228 /* sanity check */
229 if (atomic_read(&peer->usage) <= 0)
230 BUG();
231
232 write_lock(&trans->peer_lock);
233 spin_lock(&trans->peer_gylock);
234 if (likely(!atomic_dec_and_test(&peer->usage))) {
235 spin_unlock(&trans->peer_gylock);
236 write_unlock(&trans->peer_lock);
237 _leave("");
238 return;
239 }
240
241 /* move to graveyard queue */
242 list_del(&peer->link);
243 write_unlock(&trans->peer_lock);
244
245 list_add_tail(&peer->link, &trans->peer_graveyard);
246
247 BUG_ON(!list_empty(&peer->conn_active));
248
249 rxrpc_krxtimod_add_timer(&peer->timeout, rxrpc_peer_timeout * HZ);
250
251 spin_unlock(&trans->peer_gylock);
252
253 rxrpc_put_transport(trans);
254
255 _leave(" [killed]");
256} /* end rxrpc_put_peer() */
257
258/*****************************************************************************/
259/*
260 * handle a peer timing out in the graveyard
261 * - called from krxtimod
262 */
263static void rxrpc_peer_do_timeout(struct rxrpc_peer *peer)
264{
265 struct rxrpc_transport *trans = peer->trans;
266
267 _enter("%p{u=%d cc=%d a=%08x}",
268 peer,
269 atomic_read(&peer->usage),
270 atomic_read(&peer->conn_count),
271 ntohl(peer->addr.s_addr));
272
273 BUG_ON(atomic_read(&peer->usage) < 0);
274
275 /* remove from graveyard if still dead */
276 spin_lock(&trans->peer_gylock);
277 if (atomic_read(&peer->usage) == 0)
278 list_del_init(&peer->link);
279 else
280 peer = NULL;
281 spin_unlock(&trans->peer_gylock);
282
283 if (!peer) {
284 _leave("");
285 return; /* resurrected */
286 }
287
288 /* clear all connections on this peer */
289 rxrpc_conn_clearall(peer);
290
291 BUG_ON(!list_empty(&peer->conn_active));
292 BUG_ON(!list_empty(&peer->conn_graveyard));
293
294 /* inform the application layer */
295 if (peer->ops && peer->ops->discarding)
296 peer->ops->discarding(peer);
297
298 if (!list_empty(&peer->proc_link)) {
299 down_write(&rxrpc_peers_sem);
300 list_del(&peer->proc_link);
301 up_write(&rxrpc_peers_sem);
302 }
303
304 __RXACCT(atomic_dec(&rxrpc_peer_count));
305 kfree(peer);
306
307 /* if the graveyard is now empty, wake up anyone waiting for that */
308 if (atomic_dec_and_test(&trans->peer_count))
309 wake_up(&trans->peer_gy_waitq);
310
311 _leave(" [destroyed]");
312} /* end rxrpc_peer_do_timeout() */
313
314/*****************************************************************************/
315/*
316 * clear all peer records from a transport endpoint
317 */
318void rxrpc_peer_clearall(struct rxrpc_transport *trans)
319{
320 DECLARE_WAITQUEUE(myself,current);
321
322 struct rxrpc_peer *peer;
323 int err;
324
325 _enter("%p",trans);
326
327 /* there shouldn't be any active peers remaining */
328 BUG_ON(!list_empty(&trans->peer_active));
329
330 /* manually timeout all peers in the graveyard */
331 spin_lock(&trans->peer_gylock);
332 while (!list_empty(&trans->peer_graveyard)) {
333 peer = list_entry(trans->peer_graveyard.next,
334 struct rxrpc_peer, link);
335 _debug("Clearing peer %p\n", peer);
336 err = rxrpc_krxtimod_del_timer(&peer->timeout);
337 spin_unlock(&trans->peer_gylock);
338
339 if (err == 0)
340 rxrpc_peer_do_timeout(peer);
341
342 spin_lock(&trans->peer_gylock);
343 }
344 spin_unlock(&trans->peer_gylock);
345
346 /* wait for the the peer graveyard to be completely cleared */
347 set_current_state(TASK_UNINTERRUPTIBLE);
348 add_wait_queue(&trans->peer_gy_waitq, &myself);
349
350 while (atomic_read(&trans->peer_count) != 0) {
351 schedule();
352 set_current_state(TASK_UNINTERRUPTIBLE);
353 }
354
355 remove_wait_queue(&trans->peer_gy_waitq, &myself);
356 set_current_state(TASK_RUNNING);
357
358 _leave("");
359} /* end rxrpc_peer_clearall() */
360
361/*****************************************************************************/
362/*
363 * calculate and cache the Round-Trip-Time for a message and its response
364 */
365void rxrpc_peer_calculate_rtt(struct rxrpc_peer *peer,
366 struct rxrpc_message *msg,
367 struct rxrpc_message *resp)
368{
369 unsigned long long rtt;
370 int loop;
371
372 _enter("%p,%p,%p", peer, msg, resp);
373
374 /* calculate the latest RTT */
375 rtt = resp->stamp.tv_sec - msg->stamp.tv_sec;
376 rtt *= 1000000UL;
377 rtt += resp->stamp.tv_usec - msg->stamp.tv_usec;
378
379 /* add to cache */
380 peer->rtt_cache[peer->rtt_point] = rtt;
381 peer->rtt_point++;
382 peer->rtt_point %= RXRPC_RTT_CACHE_SIZE;
383
384 if (peer->rtt_usage < RXRPC_RTT_CACHE_SIZE)
385 peer->rtt_usage++;
386
387 /* recalculate RTT */
388 rtt = 0;
389 for (loop = peer->rtt_usage - 1; loop >= 0; loop--)
390 rtt += peer->rtt_cache[loop];
391
392 do_div(rtt, peer->rtt_usage);
393 peer->rtt = rtt;
394
395 _leave(" RTT=%lu.%lums",
396 (long) (peer->rtt / 1000), (long) (peer->rtt % 1000));
397
398} /* end rxrpc_peer_calculate_rtt() */
diff --git a/net/rxrpc/proc.c b/net/rxrpc/proc.c
deleted file mode 100644
index 8551c879e456..000000000000
--- a/net/rxrpc/proc.c
+++ /dev/null
@@ -1,617 +0,0 @@
1/* proc.c: /proc interface for RxRPC
2 *
3 * Copyright (C) 2002 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/sched.h>
13#include <linux/slab.h>
14#include <linux/module.h>
15#include <linux/proc_fs.h>
16#include <linux/seq_file.h>
17#include <rxrpc/rxrpc.h>
18#include <rxrpc/transport.h>
19#include <rxrpc/peer.h>
20#include <rxrpc/connection.h>
21#include <rxrpc/call.h>
22#include <rxrpc/message.h>
23#include "internal.h"
24
25static struct proc_dir_entry *proc_rxrpc;
26
27static int rxrpc_proc_transports_open(struct inode *inode, struct file *file);
28static void *rxrpc_proc_transports_start(struct seq_file *p, loff_t *pos);
29static void *rxrpc_proc_transports_next(struct seq_file *p, void *v, loff_t *pos);
30static void rxrpc_proc_transports_stop(struct seq_file *p, void *v);
31static int rxrpc_proc_transports_show(struct seq_file *m, void *v);
32
33static struct seq_operations rxrpc_proc_transports_ops = {
34 .start = rxrpc_proc_transports_start,
35 .next = rxrpc_proc_transports_next,
36 .stop = rxrpc_proc_transports_stop,
37 .show = rxrpc_proc_transports_show,
38};
39
40static const struct file_operations rxrpc_proc_transports_fops = {
41 .open = rxrpc_proc_transports_open,
42 .read = seq_read,
43 .llseek = seq_lseek,
44 .release = seq_release,
45};
46
47static int rxrpc_proc_peers_open(struct inode *inode, struct file *file);
48static void *rxrpc_proc_peers_start(struct seq_file *p, loff_t *pos);
49static void *rxrpc_proc_peers_next(struct seq_file *p, void *v, loff_t *pos);
50static void rxrpc_proc_peers_stop(struct seq_file *p, void *v);
51static int rxrpc_proc_peers_show(struct seq_file *m, void *v);
52
53static struct seq_operations rxrpc_proc_peers_ops = {
54 .start = rxrpc_proc_peers_start,
55 .next = rxrpc_proc_peers_next,
56 .stop = rxrpc_proc_peers_stop,
57 .show = rxrpc_proc_peers_show,
58};
59
60static const struct file_operations rxrpc_proc_peers_fops = {
61 .open = rxrpc_proc_peers_open,
62 .read = seq_read,
63 .llseek = seq_lseek,
64 .release = seq_release,
65};
66
67static int rxrpc_proc_conns_open(struct inode *inode, struct file *file);
68static void *rxrpc_proc_conns_start(struct seq_file *p, loff_t *pos);
69static void *rxrpc_proc_conns_next(struct seq_file *p, void *v, loff_t *pos);
70static void rxrpc_proc_conns_stop(struct seq_file *p, void *v);
71static int rxrpc_proc_conns_show(struct seq_file *m, void *v);
72
73static struct seq_operations rxrpc_proc_conns_ops = {
74 .start = rxrpc_proc_conns_start,
75 .next = rxrpc_proc_conns_next,
76 .stop = rxrpc_proc_conns_stop,
77 .show = rxrpc_proc_conns_show,
78};
79
80static const struct file_operations rxrpc_proc_conns_fops = {
81 .open = rxrpc_proc_conns_open,
82 .read = seq_read,
83 .llseek = seq_lseek,
84 .release = seq_release,
85};
86
87static int rxrpc_proc_calls_open(struct inode *inode, struct file *file);
88static void *rxrpc_proc_calls_start(struct seq_file *p, loff_t *pos);
89static void *rxrpc_proc_calls_next(struct seq_file *p, void *v, loff_t *pos);
90static void rxrpc_proc_calls_stop(struct seq_file *p, void *v);
91static int rxrpc_proc_calls_show(struct seq_file *m, void *v);
92
93static struct seq_operations rxrpc_proc_calls_ops = {
94 .start = rxrpc_proc_calls_start,
95 .next = rxrpc_proc_calls_next,
96 .stop = rxrpc_proc_calls_stop,
97 .show = rxrpc_proc_calls_show,
98};
99
100static const struct file_operations rxrpc_proc_calls_fops = {
101 .open = rxrpc_proc_calls_open,
102 .read = seq_read,
103 .llseek = seq_lseek,
104 .release = seq_release,
105};
106
107static const char *rxrpc_call_states7[] = {
108 "complet",
109 "error ",
110 "rcv_op ",
111 "rcv_arg",
112 "got_arg",
113 "snd_rpl",
114 "fin_ack",
115 "snd_arg",
116 "rcv_rpl",
117 "got_rpl"
118};
119
120static const char *rxrpc_call_error_states7[] = {
121 "no_err ",
122 "loc_abt",
123 "rmt_abt",
124 "loc_err",
125 "rmt_err"
126};
127
128/*****************************************************************************/
129/*
130 * initialise the /proc/net/rxrpc/ directory
131 */
132int rxrpc_proc_init(void)
133{
134 struct proc_dir_entry *p;
135
136 proc_rxrpc = proc_mkdir("rxrpc", proc_net);
137 if (!proc_rxrpc)
138 goto error;
139 proc_rxrpc->owner = THIS_MODULE;
140
141 p = create_proc_entry("calls", 0, proc_rxrpc);
142 if (!p)
143 goto error_proc;
144 p->proc_fops = &rxrpc_proc_calls_fops;
145 p->owner = THIS_MODULE;
146
147 p = create_proc_entry("connections", 0, proc_rxrpc);
148 if (!p)
149 goto error_calls;
150 p->proc_fops = &rxrpc_proc_conns_fops;
151 p->owner = THIS_MODULE;
152
153 p = create_proc_entry("peers", 0, proc_rxrpc);
154 if (!p)
155 goto error_calls;
156 p->proc_fops = &rxrpc_proc_peers_fops;
157 p->owner = THIS_MODULE;
158
159 p = create_proc_entry("transports", 0, proc_rxrpc);
160 if (!p)
161 goto error_conns;
162 p->proc_fops = &rxrpc_proc_transports_fops;
163 p->owner = THIS_MODULE;
164
165 return 0;
166
167 error_conns:
168 remove_proc_entry("connections", proc_rxrpc);
169 error_calls:
170 remove_proc_entry("calls", proc_rxrpc);
171 error_proc:
172 remove_proc_entry("rxrpc", proc_net);
173 error:
174 return -ENOMEM;
175} /* end rxrpc_proc_init() */
176
177/*****************************************************************************/
178/*
179 * clean up the /proc/net/rxrpc/ directory
180 */
181void rxrpc_proc_cleanup(void)
182{
183 remove_proc_entry("transports", proc_rxrpc);
184 remove_proc_entry("peers", proc_rxrpc);
185 remove_proc_entry("connections", proc_rxrpc);
186 remove_proc_entry("calls", proc_rxrpc);
187
188 remove_proc_entry("rxrpc", proc_net);
189
190} /* end rxrpc_proc_cleanup() */
191
192/*****************************************************************************/
193/*
194 * open "/proc/net/rxrpc/transports" which provides a summary of extant transports
195 */
196static int rxrpc_proc_transports_open(struct inode *inode, struct file *file)
197{
198 struct seq_file *m;
199 int ret;
200
201 ret = seq_open(file, &rxrpc_proc_transports_ops);
202 if (ret < 0)
203 return ret;
204
205 m = file->private_data;
206 m->private = PDE(inode)->data;
207
208 return 0;
209} /* end rxrpc_proc_transports_open() */
210
211/*****************************************************************************/
212/*
213 * set up the iterator to start reading from the transports list and return the first item
214 */
215static void *rxrpc_proc_transports_start(struct seq_file *m, loff_t *_pos)
216{
217 struct list_head *_p;
218 loff_t pos = *_pos;
219
220 /* lock the list against modification */
221 down_read(&rxrpc_proc_transports_sem);
222
223 /* allow for the header line */
224 if (!pos)
225 return SEQ_START_TOKEN;
226 pos--;
227
228 /* find the n'th element in the list */
229 list_for_each(_p, &rxrpc_proc_transports)
230 if (!pos--)
231 break;
232
233 return _p != &rxrpc_proc_transports ? _p : NULL;
234} /* end rxrpc_proc_transports_start() */
235
236/*****************************************************************************/
237/*
238 * move to next call in transports list
239 */
240static void *rxrpc_proc_transports_next(struct seq_file *p, void *v, loff_t *pos)
241{
242 struct list_head *_p;
243
244 (*pos)++;
245
246 _p = v;
247 _p = (v == SEQ_START_TOKEN) ? rxrpc_proc_transports.next : _p->next;
248
249 return _p != &rxrpc_proc_transports ? _p : NULL;
250} /* end rxrpc_proc_transports_next() */
251
252/*****************************************************************************/
253/*
254 * clean up after reading from the transports list
255 */
256static void rxrpc_proc_transports_stop(struct seq_file *p, void *v)
257{
258 up_read(&rxrpc_proc_transports_sem);
259
260} /* end rxrpc_proc_transports_stop() */
261
262/*****************************************************************************/
263/*
264 * display a header line followed by a load of call lines
265 */
266static int rxrpc_proc_transports_show(struct seq_file *m, void *v)
267{
268 struct rxrpc_transport *trans =
269 list_entry(v, struct rxrpc_transport, proc_link);
270
271 /* display header on line 1 */
272 if (v == SEQ_START_TOKEN) {
273 seq_puts(m, "LOCAL USE\n");
274 return 0;
275 }
276
277 /* display one transport per line on subsequent lines */
278 seq_printf(m, "%5hu %3d\n",
279 trans->port,
280 atomic_read(&trans->usage)
281 );
282
283 return 0;
284} /* end rxrpc_proc_transports_show() */
285
286/*****************************************************************************/
287/*
288 * open "/proc/net/rxrpc/peers" which provides a summary of extant peers
289 */
290static int rxrpc_proc_peers_open(struct inode *inode, struct file *file)
291{
292 struct seq_file *m;
293 int ret;
294
295 ret = seq_open(file, &rxrpc_proc_peers_ops);
296 if (ret < 0)
297 return ret;
298
299 m = file->private_data;
300 m->private = PDE(inode)->data;
301
302 return 0;
303} /* end rxrpc_proc_peers_open() */
304
305/*****************************************************************************/
306/*
307 * set up the iterator to start reading from the peers list and return the
308 * first item
309 */
310static void *rxrpc_proc_peers_start(struct seq_file *m, loff_t *_pos)
311{
312 struct list_head *_p;
313 loff_t pos = *_pos;
314
315 /* lock the list against modification */
316 down_read(&rxrpc_peers_sem);
317
318 /* allow for the header line */
319 if (!pos)
320 return SEQ_START_TOKEN;
321 pos--;
322
323 /* find the n'th element in the list */
324 list_for_each(_p, &rxrpc_peers)
325 if (!pos--)
326 break;
327
328 return _p != &rxrpc_peers ? _p : NULL;
329} /* end rxrpc_proc_peers_start() */
330
331/*****************************************************************************/
332/*
333 * move to next conn in peers list
334 */
335static void *rxrpc_proc_peers_next(struct seq_file *p, void *v, loff_t *pos)
336{
337 struct list_head *_p;
338
339 (*pos)++;
340
341 _p = v;
342 _p = (v == SEQ_START_TOKEN) ? rxrpc_peers.next : _p->next;
343
344 return _p != &rxrpc_peers ? _p : NULL;
345} /* end rxrpc_proc_peers_next() */
346
347/*****************************************************************************/
348/*
349 * clean up after reading from the peers list
350 */
351static void rxrpc_proc_peers_stop(struct seq_file *p, void *v)
352{
353 up_read(&rxrpc_peers_sem);
354
355} /* end rxrpc_proc_peers_stop() */
356
357/*****************************************************************************/
358/*
359 * display a header line followed by a load of conn lines
360 */
361static int rxrpc_proc_peers_show(struct seq_file *m, void *v)
362{
363 struct rxrpc_peer *peer = list_entry(v, struct rxrpc_peer, proc_link);
364 long timeout;
365
366 /* display header on line 1 */
367 if (v == SEQ_START_TOKEN) {
368 seq_puts(m, "LOCAL REMOTE USAGE CONNS TIMEOUT"
369 " MTU RTT(uS)\n");
370 return 0;
371 }
372
373 /* display one peer per line on subsequent lines */
374 timeout = 0;
375 if (!list_empty(&peer->timeout.link))
376 timeout = (long) peer->timeout.timo_jif -
377 (long) jiffies;
378
379 seq_printf(m, "%5hu %08x %5d %5d %8ld %5Zu %7lu\n",
380 peer->trans->port,
381 ntohl(peer->addr.s_addr),
382 atomic_read(&peer->usage),
383 atomic_read(&peer->conn_count),
384 timeout,
385 peer->if_mtu,
386 (long) peer->rtt
387 );
388
389 return 0;
390} /* end rxrpc_proc_peers_show() */
391
392/*****************************************************************************/
393/*
394 * open "/proc/net/rxrpc/connections" which provides a summary of extant
395 * connections
396 */
397static int rxrpc_proc_conns_open(struct inode *inode, struct file *file)
398{
399 struct seq_file *m;
400 int ret;
401
402 ret = seq_open(file, &rxrpc_proc_conns_ops);
403 if (ret < 0)
404 return ret;
405
406 m = file->private_data;
407 m->private = PDE(inode)->data;
408
409 return 0;
410} /* end rxrpc_proc_conns_open() */
411
412/*****************************************************************************/
413/*
414 * set up the iterator to start reading from the conns list and return the
415 * first item
416 */
417static void *rxrpc_proc_conns_start(struct seq_file *m, loff_t *_pos)
418{
419 struct list_head *_p;
420 loff_t pos = *_pos;
421
422 /* lock the list against modification */
423 down_read(&rxrpc_conns_sem);
424
425 /* allow for the header line */
426 if (!pos)
427 return SEQ_START_TOKEN;
428 pos--;
429
430 /* find the n'th element in the list */
431 list_for_each(_p, &rxrpc_conns)
432 if (!pos--)
433 break;
434
435 return _p != &rxrpc_conns ? _p : NULL;
436} /* end rxrpc_proc_conns_start() */
437
438/*****************************************************************************/
439/*
440 * move to next conn in conns list
441 */
442static void *rxrpc_proc_conns_next(struct seq_file *p, void *v, loff_t *pos)
443{
444 struct list_head *_p;
445
446 (*pos)++;
447
448 _p = v;
449 _p = (v == SEQ_START_TOKEN) ? rxrpc_conns.next : _p->next;
450
451 return _p != &rxrpc_conns ? _p : NULL;
452} /* end rxrpc_proc_conns_next() */
453
454/*****************************************************************************/
455/*
456 * clean up after reading from the conns list
457 */
458static void rxrpc_proc_conns_stop(struct seq_file *p, void *v)
459{
460 up_read(&rxrpc_conns_sem);
461
462} /* end rxrpc_proc_conns_stop() */
463
464/*****************************************************************************/
465/*
466 * display a header line followed by a load of conn lines
467 */
468static int rxrpc_proc_conns_show(struct seq_file *m, void *v)
469{
470 struct rxrpc_connection *conn;
471 long timeout;
472
473 conn = list_entry(v, struct rxrpc_connection, proc_link);
474
475 /* display header on line 1 */
476 if (v == SEQ_START_TOKEN) {
477 seq_puts(m,
478 "LOCAL REMOTE RPORT SRVC CONN END SERIALNO "
479 "CALLNO MTU TIMEOUT"
480 "\n");
481 return 0;
482 }
483
484 /* display one conn per line on subsequent lines */
485 timeout = 0;
486 if (!list_empty(&conn->timeout.link))
487 timeout = (long) conn->timeout.timo_jif -
488 (long) jiffies;
489
490 seq_printf(m,
491 "%5hu %08x %5hu %04hx %08x %-3.3s %08x %08x %5Zu %8ld\n",
492 conn->trans->port,
493 ntohl(conn->addr.sin_addr.s_addr),
494 ntohs(conn->addr.sin_port),
495 ntohs(conn->service_id),
496 ntohl(conn->conn_id),
497 conn->out_clientflag ? "CLT" : "SRV",
498 conn->serial_counter,
499 conn->call_counter,
500 conn->mtu_size,
501 timeout
502 );
503
504 return 0;
505} /* end rxrpc_proc_conns_show() */
506
507/*****************************************************************************/
508/*
509 * open "/proc/net/rxrpc/calls" which provides a summary of extant calls
510 */
511static int rxrpc_proc_calls_open(struct inode *inode, struct file *file)
512{
513 struct seq_file *m;
514 int ret;
515
516 ret = seq_open(file, &rxrpc_proc_calls_ops);
517 if (ret < 0)
518 return ret;
519
520 m = file->private_data;
521 m->private = PDE(inode)->data;
522
523 return 0;
524} /* end rxrpc_proc_calls_open() */
525
526/*****************************************************************************/
527/*
528 * set up the iterator to start reading from the calls list and return the
529 * first item
530 */
531static void *rxrpc_proc_calls_start(struct seq_file *m, loff_t *_pos)
532{
533 struct list_head *_p;
534 loff_t pos = *_pos;
535
536 /* lock the list against modification */
537 down_read(&rxrpc_calls_sem);
538
539 /* allow for the header line */
540 if (!pos)
541 return SEQ_START_TOKEN;
542 pos--;
543
544 /* find the n'th element in the list */
545 list_for_each(_p, &rxrpc_calls)
546 if (!pos--)
547 break;
548
549 return _p != &rxrpc_calls ? _p : NULL;
550} /* end rxrpc_proc_calls_start() */
551
552/*****************************************************************************/
553/*
554 * move to next call in calls list
555 */
556static void *rxrpc_proc_calls_next(struct seq_file *p, void *v, loff_t *pos)
557{
558 struct list_head *_p;
559
560 (*pos)++;
561
562 _p = v;
563 _p = (v == SEQ_START_TOKEN) ? rxrpc_calls.next : _p->next;
564
565 return _p != &rxrpc_calls ? _p : NULL;
566} /* end rxrpc_proc_calls_next() */
567
568/*****************************************************************************/
569/*
570 * clean up after reading from the calls list
571 */
572static void rxrpc_proc_calls_stop(struct seq_file *p, void *v)
573{
574 up_read(&rxrpc_calls_sem);
575
576} /* end rxrpc_proc_calls_stop() */
577
578/*****************************************************************************/
579/*
580 * display a header line followed by a load of call lines
581 */
582static int rxrpc_proc_calls_show(struct seq_file *m, void *v)
583{
584 struct rxrpc_call *call = list_entry(v, struct rxrpc_call, call_link);
585
586 /* display header on line 1 */
587 if (v == SEQ_START_TOKEN) {
588 seq_puts(m,
589 "LOCAL REMOT SRVC CONN CALL DIR USE "
590 " L STATE OPCODE ABORT ERRNO\n"
591 );
592 return 0;
593 }
594
595 /* display one call per line on subsequent lines */
596 seq_printf(m,
597 "%5hu %5hu %04hx %08x %08x %s %3u%c"
598 " %c %-7.7s %6d %08x %5d\n",
599 call->conn->trans->port,
600 ntohs(call->conn->addr.sin_port),
601 ntohs(call->conn->service_id),
602 ntohl(call->conn->conn_id),
603 ntohl(call->call_id),
604 call->conn->service ? "SVC" : "CLT",
605 atomic_read(&call->usage),
606 waitqueue_active(&call->waitq) ? 'w' : ' ',
607 call->app_last_rcv ? 'Y' : '-',
608 (call->app_call_state!=RXRPC_CSTATE_ERROR ?
609 rxrpc_call_states7[call->app_call_state] :
610 rxrpc_call_error_states7[call->app_err_state]),
611 call->app_opcode,
612 call->app_abort_code,
613 call->app_errno
614 );
615
616 return 0;
617} /* end rxrpc_proc_calls_show() */
diff --git a/net/rxrpc/rxrpc_syms.c b/net/rxrpc/rxrpc_syms.c
deleted file mode 100644
index 9896fd87a4d4..000000000000
--- a/net/rxrpc/rxrpc_syms.c
+++ /dev/null
@@ -1,34 +0,0 @@
1/* rxrpc_syms.c: exported Rx RPC layer interface symbols
2 *
3 * Copyright (C) 2002 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
14#include <rxrpc/transport.h>
15#include <rxrpc/connection.h>
16#include <rxrpc/call.h>
17#include <rxrpc/krxiod.h>
18
19/* call.c */
20EXPORT_SYMBOL(rxrpc_create_call);
21EXPORT_SYMBOL(rxrpc_put_call);
22EXPORT_SYMBOL(rxrpc_call_abort);
23EXPORT_SYMBOL(rxrpc_call_read_data);
24EXPORT_SYMBOL(rxrpc_call_write_data);
25
26/* connection.c */
27EXPORT_SYMBOL(rxrpc_create_connection);
28EXPORT_SYMBOL(rxrpc_put_connection);
29
30/* transport.c */
31EXPORT_SYMBOL(rxrpc_create_transport);
32EXPORT_SYMBOL(rxrpc_put_transport);
33EXPORT_SYMBOL(rxrpc_add_service);
34EXPORT_SYMBOL(rxrpc_del_service);
diff --git a/net/rxrpc/sysctl.c b/net/rxrpc/sysctl.c
deleted file mode 100644
index 884290754af7..000000000000
--- a/net/rxrpc/sysctl.c
+++ /dev/null
@@ -1,121 +0,0 @@
1/* sysctl.c: Rx RPC control
2 *
3 * Copyright (C) 2002 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/sched.h>
13#include <linux/slab.h>
14#include <linux/module.h>
15#include <linux/sysctl.h>
16#include <rxrpc/types.h>
17#include <rxrpc/rxrpc.h>
18#include <asm/errno.h>
19#include "internal.h"
20
21int rxrpc_ktrace;
22int rxrpc_kdebug;
23int rxrpc_kproto;
24int rxrpc_knet;
25
26#ifdef CONFIG_SYSCTL
27static struct ctl_table_header *rxrpc_sysctl = NULL;
28
29static ctl_table rxrpc_sysctl_table[] = {
30 {
31 .ctl_name = 1,
32 .procname = "kdebug",
33 .data = &rxrpc_kdebug,
34 .maxlen = sizeof(int),
35 .mode = 0644,
36 .proc_handler = &proc_dointvec
37 },
38 {
39 .ctl_name = 2,
40 .procname = "ktrace",
41 .data = &rxrpc_ktrace,
42 .maxlen = sizeof(int),
43 .mode = 0644,
44 .proc_handler = &proc_dointvec
45 },
46 {
47 .ctl_name = 3,
48 .procname = "kproto",
49 .data = &rxrpc_kproto,
50 .maxlen = sizeof(int),
51 .mode = 0644,
52 .proc_handler = &proc_dointvec
53 },
54 {
55 .ctl_name = 4,
56 .procname = "knet",
57 .data = &rxrpc_knet,
58 .maxlen = sizeof(int),
59 .mode = 0644,
60 .proc_handler = &proc_dointvec
61 },
62 {
63 .ctl_name = 5,
64 .procname = "peertimo",
65 .data = &rxrpc_peer_timeout,
66 .maxlen = sizeof(unsigned long),
67 .mode = 0644,
68 .proc_handler = &proc_doulongvec_minmax
69 },
70 {
71 .ctl_name = 6,
72 .procname = "conntimo",
73 .data = &rxrpc_conn_timeout,
74 .maxlen = sizeof(unsigned long),
75 .mode = 0644,
76 .proc_handler = &proc_doulongvec_minmax
77 },
78 { .ctl_name = 0 }
79};
80
81static ctl_table rxrpc_dir_sysctl_table[] = {
82 {
83 .ctl_name = 1,
84 .procname = "rxrpc",
85 .maxlen = 0,
86 .mode = 0555,
87 .child = rxrpc_sysctl_table
88 },
89 { .ctl_name = 0 }
90};
91#endif /* CONFIG_SYSCTL */
92
93/*****************************************************************************/
94/*
95 * initialise the sysctl stuff for Rx RPC
96 */
97int rxrpc_sysctl_init(void)
98{
99#ifdef CONFIG_SYSCTL
100 rxrpc_sysctl = register_sysctl_table(rxrpc_dir_sysctl_table);
101 if (!rxrpc_sysctl)
102 return -ENOMEM;
103#endif /* CONFIG_SYSCTL */
104
105 return 0;
106} /* end rxrpc_sysctl_init() */
107
108/*****************************************************************************/
109/*
110 * clean up the sysctl stuff for Rx RPC
111 */
112void rxrpc_sysctl_cleanup(void)
113{
114#ifdef CONFIG_SYSCTL
115 if (rxrpc_sysctl) {
116 unregister_sysctl_table(rxrpc_sysctl);
117 rxrpc_sysctl = NULL;
118 }
119#endif /* CONFIG_SYSCTL */
120
121} /* end rxrpc_sysctl_cleanup() */
diff --git a/net/rxrpc/transport.c b/net/rxrpc/transport.c
deleted file mode 100644
index 62398fd01f85..000000000000
--- a/net/rxrpc/transport.c
+++ /dev/null
@@ -1,846 +0,0 @@
1/* transport.c: Rx Transport routines
2 *
3 * Copyright (C) 2002 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/slab.h>
13#include <linux/module.h>
14#include <rxrpc/transport.h>
15#include <rxrpc/peer.h>
16#include <rxrpc/connection.h>
17#include <rxrpc/call.h>
18#include <rxrpc/message.h>
19#include <rxrpc/krxiod.h>
20#include <rxrpc/krxsecd.h>
21#include <linux/udp.h>
22#include <linux/in.h>
23#include <linux/in6.h>
24#include <linux/icmp.h>
25#include <linux/skbuff.h>
26#include <net/sock.h>
27#include <net/ip.h>
28#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
29#include <linux/ipv6.h> /* this should _really_ be in errqueue.h.. */
30#endif
31#include <linux/errqueue.h>
32#include <asm/uaccess.h>
33#include "internal.h"
34
35struct errormsg {
36 struct cmsghdr cmsg; /* control message header */
37 struct sock_extended_err ee; /* extended error information */
38 struct sockaddr_in icmp_src; /* ICMP packet source address */
39};
40
41static DEFINE_SPINLOCK(rxrpc_transports_lock);
42static struct list_head rxrpc_transports = LIST_HEAD_INIT(rxrpc_transports);
43
44__RXACCT_DECL(atomic_t rxrpc_transport_count);
45LIST_HEAD(rxrpc_proc_transports);
46DECLARE_RWSEM(rxrpc_proc_transports_sem);
47
48static void rxrpc_data_ready(struct sock *sk, int count);
49static void rxrpc_error_report(struct sock *sk);
50static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans,
51 struct list_head *msgq);
52static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans);
53
54/*****************************************************************************/
55/*
56 * create a new transport endpoint using the specified UDP port
57 */
58int rxrpc_create_transport(unsigned short port,
59 struct rxrpc_transport **_trans)
60{
61 struct rxrpc_transport *trans;
62 struct sockaddr_in sin;
63 mm_segment_t oldfs;
64 struct sock *sock;
65 int ret, opt;
66
67 _enter("%hu", port);
68
69 trans = kzalloc(sizeof(struct rxrpc_transport), GFP_KERNEL);
70 if (!trans)
71 return -ENOMEM;
72
73 atomic_set(&trans->usage, 1);
74 INIT_LIST_HEAD(&trans->services);
75 INIT_LIST_HEAD(&trans->link);
76 INIT_LIST_HEAD(&trans->krxiodq_link);
77 spin_lock_init(&trans->lock);
78 INIT_LIST_HEAD(&trans->peer_active);
79 INIT_LIST_HEAD(&trans->peer_graveyard);
80 spin_lock_init(&trans->peer_gylock);
81 init_waitqueue_head(&trans->peer_gy_waitq);
82 rwlock_init(&trans->peer_lock);
83 atomic_set(&trans->peer_count, 0);
84 trans->port = port;
85
86 /* create a UDP socket to be my actual transport endpoint */
87 ret = sock_create_kern(PF_INET, SOCK_DGRAM, IPPROTO_UDP, &trans->socket);
88 if (ret < 0)
89 goto error;
90
91 /* use the specified port */
92 if (port) {
93 memset(&sin, 0, sizeof(sin));
94 sin.sin_family = AF_INET;
95 sin.sin_port = htons(port);
96 ret = trans->socket->ops->bind(trans->socket,
97 (struct sockaddr *) &sin,
98 sizeof(sin));
99 if (ret < 0)
100 goto error;
101 }
102
103 opt = 1;
104 oldfs = get_fs();
105 set_fs(KERNEL_DS);
106 ret = trans->socket->ops->setsockopt(trans->socket, SOL_IP, IP_RECVERR,
107 (char *) &opt, sizeof(opt));
108 set_fs(oldfs);
109
110 spin_lock(&rxrpc_transports_lock);
111 list_add(&trans->link, &rxrpc_transports);
112 spin_unlock(&rxrpc_transports_lock);
113
114 /* set the socket up */
115 sock = trans->socket->sk;
116 sock->sk_user_data = trans;
117 sock->sk_data_ready = rxrpc_data_ready;
118 sock->sk_error_report = rxrpc_error_report;
119
120 down_write(&rxrpc_proc_transports_sem);
121 list_add_tail(&trans->proc_link, &rxrpc_proc_transports);
122 up_write(&rxrpc_proc_transports_sem);
123
124 __RXACCT(atomic_inc(&rxrpc_transport_count));
125
126 *_trans = trans;
127 _leave(" = 0 (%p)", trans);
128 return 0;
129
130 error:
131 /* finish cleaning up the transport (not really needed here, but...) */
132 if (trans->socket)
133 trans->socket->ops->shutdown(trans->socket, 2);
134
135 /* close the socket */
136 if (trans->socket) {
137 trans->socket->sk->sk_user_data = NULL;
138 sock_release(trans->socket);
139 trans->socket = NULL;
140 }
141
142 kfree(trans);
143
144
145 _leave(" = %d", ret);
146 return ret;
147} /* end rxrpc_create_transport() */
148
149/*****************************************************************************/
150/*
151 * destroy a transport endpoint
152 */
153void rxrpc_put_transport(struct rxrpc_transport *trans)
154{
155 _enter("%p{u=%d p=%hu}",
156 trans, atomic_read(&trans->usage), trans->port);
157
158 BUG_ON(atomic_read(&trans->usage) <= 0);
159
160 /* to prevent a race, the decrement and the dequeue must be
161 * effectively atomic */
162 spin_lock(&rxrpc_transports_lock);
163 if (likely(!atomic_dec_and_test(&trans->usage))) {
164 spin_unlock(&rxrpc_transports_lock);
165 _leave("");
166 return;
167 }
168
169 list_del(&trans->link);
170 spin_unlock(&rxrpc_transports_lock);
171
172 /* finish cleaning up the transport */
173 if (trans->socket)
174 trans->socket->ops->shutdown(trans->socket, 2);
175
176 rxrpc_krxsecd_clear_transport(trans);
177 rxrpc_krxiod_dequeue_transport(trans);
178
179 /* discard all peer information */
180 rxrpc_peer_clearall(trans);
181
182 down_write(&rxrpc_proc_transports_sem);
183 list_del(&trans->proc_link);
184 up_write(&rxrpc_proc_transports_sem);
185 __RXACCT(atomic_dec(&rxrpc_transport_count));
186
187 /* close the socket */
188 if (trans->socket) {
189 trans->socket->sk->sk_user_data = NULL;
190 sock_release(trans->socket);
191 trans->socket = NULL;
192 }
193
194 kfree(trans);
195
196 _leave("");
197} /* end rxrpc_put_transport() */
198
199/*****************************************************************************/
200/*
201 * add a service to a transport to be listened upon
202 */
203int rxrpc_add_service(struct rxrpc_transport *trans,
204 struct rxrpc_service *newsrv)
205{
206 struct rxrpc_service *srv;
207 struct list_head *_p;
208 int ret = -EEXIST;
209
210 _enter("%p{%hu},%p{%hu}",
211 trans, trans->port, newsrv, newsrv->service_id);
212
213 /* verify that the service ID is not already present */
214 spin_lock(&trans->lock);
215
216 list_for_each(_p, &trans->services) {
217 srv = list_entry(_p, struct rxrpc_service, link);
218 if (srv->service_id == newsrv->service_id)
219 goto out;
220 }
221
222 /* okay - add the transport to the list */
223 list_add_tail(&newsrv->link, &trans->services);
224 rxrpc_get_transport(trans);
225 ret = 0;
226
227 out:
228 spin_unlock(&trans->lock);
229
230 _leave("= %d", ret);
231 return ret;
232} /* end rxrpc_add_service() */
233
234/*****************************************************************************/
235/*
236 * remove a service from a transport
237 */
238void rxrpc_del_service(struct rxrpc_transport *trans, struct rxrpc_service *srv)
239{
240 _enter("%p{%hu},%p{%hu}", trans, trans->port, srv, srv->service_id);
241
242 spin_lock(&trans->lock);
243 list_del(&srv->link);
244 spin_unlock(&trans->lock);
245
246 rxrpc_put_transport(trans);
247
248 _leave("");
249} /* end rxrpc_del_service() */
250
251/*****************************************************************************/
252/*
253 * INET callback when data has been received on the socket.
254 */
255static void rxrpc_data_ready(struct sock *sk, int count)
256{
257 struct rxrpc_transport *trans;
258
259 _enter("%p{t=%p},%d", sk, sk->sk_user_data, count);
260
261 /* queue the transport for attention by krxiod */
262 trans = (struct rxrpc_transport *) sk->sk_user_data;
263 if (trans)
264 rxrpc_krxiod_queue_transport(trans);
265
266 /* wake up anyone waiting on the socket */
267 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
268 wake_up_interruptible(sk->sk_sleep);
269
270 _leave("");
271} /* end rxrpc_data_ready() */
272
273/*****************************************************************************/
274/*
275 * INET callback when an ICMP error packet is received
276 * - sk->err is error (EHOSTUNREACH, EPROTO or EMSGSIZE)
277 */
278static void rxrpc_error_report(struct sock *sk)
279{
280 struct rxrpc_transport *trans;
281
282 _enter("%p{t=%p}", sk, sk->sk_user_data);
283
284 /* queue the transport for attention by krxiod */
285 trans = (struct rxrpc_transport *) sk->sk_user_data;
286 if (trans) {
287 trans->error_rcvd = 1;
288 rxrpc_krxiod_queue_transport(trans);
289 }
290
291 /* wake up anyone waiting on the socket */
292 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
293 wake_up_interruptible(sk->sk_sleep);
294
295 _leave("");
296} /* end rxrpc_error_report() */
297
298/*****************************************************************************/
299/*
300 * split a message up, allocating message records and filling them in
301 * from the contents of a socket buffer
302 */
303static int rxrpc_incoming_msg(struct rxrpc_transport *trans,
304 struct sk_buff *pkt,
305 struct list_head *msgq)
306{
307 struct rxrpc_message *msg;
308 int ret;
309
310 _enter("");
311
312 msg = kzalloc(sizeof(struct rxrpc_message), GFP_KERNEL);
313 if (!msg) {
314 _leave(" = -ENOMEM");
315 return -ENOMEM;
316 }
317
318 atomic_set(&msg->usage, 1);
319 list_add_tail(&msg->link,msgq);
320
321 /* dig out the Rx routing parameters */
322 if (skb_copy_bits(pkt, sizeof(struct udphdr),
323 &msg->hdr, sizeof(msg->hdr)) < 0) {
324 ret = -EBADMSG;
325 goto error;
326 }
327
328 msg->trans = trans;
329 msg->state = RXRPC_MSG_RECEIVED;
330 skb_get_timestamp(pkt, &msg->stamp);
331 if (msg->stamp.tv_sec == 0) {
332 do_gettimeofday(&msg->stamp);
333 if (pkt->sk)
334 sock_enable_timestamp(pkt->sk);
335 }
336 msg->seq = ntohl(msg->hdr.seq);
337
338 /* attach the packet */
339 skb_get(pkt);
340 msg->pkt = pkt;
341
342 msg->offset = sizeof(struct udphdr) + sizeof(struct rxrpc_header);
343 msg->dsize = msg->pkt->len - msg->offset;
344
345 _net("Rx Received packet from %s (%08x;%08x,%1x,%d,%s,%02x,%d,%d)",
346 msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server",
347 ntohl(msg->hdr.epoch),
348 (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT,
349 ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK,
350 ntohl(msg->hdr.callNumber),
351 rxrpc_pkts[msg->hdr.type],
352 msg->hdr.flags,
353 ntohs(msg->hdr.serviceId),
354 msg->hdr.securityIndex);
355
356 __RXACCT(atomic_inc(&rxrpc_message_count));
357
358 /* split off jumbo packets */
359 while (msg->hdr.type == RXRPC_PACKET_TYPE_DATA &&
360 msg->hdr.flags & RXRPC_JUMBO_PACKET
361 ) {
362 struct rxrpc_jumbo_header jumbo;
363 struct rxrpc_message *jumbomsg = msg;
364
365 _debug("split jumbo packet");
366
367 /* quick sanity check */
368 ret = -EBADMSG;
369 if (msg->dsize <
370 RXRPC_JUMBO_DATALEN + sizeof(struct rxrpc_jumbo_header))
371 goto error;
372 if (msg->hdr.flags & RXRPC_LAST_PACKET)
373 goto error;
374
375 /* dig out the secondary header */
376 if (skb_copy_bits(pkt, msg->offset + RXRPC_JUMBO_DATALEN,
377 &jumbo, sizeof(jumbo)) < 0)
378 goto error;
379
380 /* allocate a new message record */
381 ret = -ENOMEM;
382 msg = kmemdup(jumbomsg, sizeof(struct rxrpc_message), GFP_KERNEL);
383 if (!msg)
384 goto error;
385
386 list_add_tail(&msg->link, msgq);
387
388 /* adjust the jumbo packet */
389 jumbomsg->dsize = RXRPC_JUMBO_DATALEN;
390
391 /* attach the packet here too */
392 skb_get(pkt);
393
394 /* adjust the parameters */
395 msg->seq++;
396 msg->hdr.seq = htonl(msg->seq);
397 msg->hdr.serial = htonl(ntohl(msg->hdr.serial) + 1);
398 msg->offset += RXRPC_JUMBO_DATALEN +
399 sizeof(struct rxrpc_jumbo_header);
400 msg->dsize -= RXRPC_JUMBO_DATALEN +
401 sizeof(struct rxrpc_jumbo_header);
402 msg->hdr.flags = jumbo.flags;
403 msg->hdr._rsvd = jumbo._rsvd;
404
405 _net("Rx Split jumbo packet from %s"
406 " (%08x;%08x,%1x,%d,%s,%02x,%d,%d)",
407 msg->hdr.flags & RXRPC_CLIENT_INITIATED ? "client" : "server",
408 ntohl(msg->hdr.epoch),
409 (ntohl(msg->hdr.cid) & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT,
410 ntohl(msg->hdr.cid) & RXRPC_CHANNELMASK,
411 ntohl(msg->hdr.callNumber),
412 rxrpc_pkts[msg->hdr.type],
413 msg->hdr.flags,
414 ntohs(msg->hdr.serviceId),
415 msg->hdr.securityIndex);
416
417 __RXACCT(atomic_inc(&rxrpc_message_count));
418 }
419
420 _leave(" = 0 #%d", atomic_read(&rxrpc_message_count));
421 return 0;
422
423 error:
424 while (!list_empty(msgq)) {
425 msg = list_entry(msgq->next, struct rxrpc_message, link);
426 list_del_init(&msg->link);
427
428 rxrpc_put_message(msg);
429 }
430
431 _leave(" = %d", ret);
432 return ret;
433} /* end rxrpc_incoming_msg() */
434
435/*****************************************************************************/
436/*
437 * accept a new call
438 * - called from krxiod in process context
439 */
440void rxrpc_trans_receive_packet(struct rxrpc_transport *trans)
441{
442 struct rxrpc_message *msg;
443 struct rxrpc_peer *peer;
444 struct sk_buff *pkt;
445 int ret;
446 __be32 addr;
447 __be16 port;
448
449 LIST_HEAD(msgq);
450
451 _enter("%p{%d}", trans, trans->port);
452
453 for (;;) {
454 /* deal with outstanting errors first */
455 if (trans->error_rcvd)
456 rxrpc_trans_receive_error_report(trans);
457
458 /* attempt to receive a packet */
459 pkt = skb_recv_datagram(trans->socket->sk, 0, 1, &ret);
460 if (!pkt) {
461 if (ret == -EAGAIN) {
462 _leave(" EAGAIN");
463 return;
464 }
465
466 /* an icmp error may have occurred */
467 rxrpc_krxiod_queue_transport(trans);
468 _leave(" error %d\n", ret);
469 return;
470 }
471
472 /* we'll probably need to checksum it (didn't call
473 * sock_recvmsg) */
474 if (skb_checksum_complete(pkt)) {
475 kfree_skb(pkt);
476 rxrpc_krxiod_queue_transport(trans);
477 _leave(" CSUM failed");
478 return;
479 }
480
481 addr = ip_hdr(pkt)->saddr;
482 port = udp_hdr(pkt)->source;
483
484 _net("Rx Received UDP packet from %08x:%04hu",
485 ntohl(addr), ntohs(port));
486
487 /* unmarshall the Rx parameters and split jumbo packets */
488 ret = rxrpc_incoming_msg(trans, pkt, &msgq);
489 if (ret < 0) {
490 kfree_skb(pkt);
491 rxrpc_krxiod_queue_transport(trans);
492 _leave(" bad packet");
493 return;
494 }
495
496 BUG_ON(list_empty(&msgq));
497
498 msg = list_entry(msgq.next, struct rxrpc_message, link);
499
500 /* locate the record for the peer from which it
501 * originated */
502 ret = rxrpc_peer_lookup(trans, addr, &peer);
503 if (ret < 0) {
504 kdebug("Rx No connections from that peer");
505 rxrpc_trans_immediate_abort(trans, msg, -EINVAL);
506 goto finished_msg;
507 }
508
509 /* try and find a matching connection */
510 ret = rxrpc_connection_lookup(peer, msg, &msg->conn);
511 if (ret < 0) {
512 kdebug("Rx Unknown Connection");
513 rxrpc_trans_immediate_abort(trans, msg, -EINVAL);
514 rxrpc_put_peer(peer);
515 goto finished_msg;
516 }
517 rxrpc_put_peer(peer);
518
519 /* deal with the first packet of a new call */
520 if (msg->hdr.flags & RXRPC_CLIENT_INITIATED &&
521 msg->hdr.type == RXRPC_PACKET_TYPE_DATA &&
522 ntohl(msg->hdr.seq) == 1
523 ) {
524 _debug("Rx New server call");
525 rxrpc_trans_receive_new_call(trans, &msgq);
526 goto finished_msg;
527 }
528
529 /* deal with subsequent packet(s) of call */
530 _debug("Rx Call packet");
531 while (!list_empty(&msgq)) {
532 msg = list_entry(msgq.next, struct rxrpc_message, link);
533 list_del_init(&msg->link);
534
535 ret = rxrpc_conn_receive_call_packet(msg->conn, NULL, msg);
536 if (ret < 0) {
537 rxrpc_trans_immediate_abort(trans, msg, ret);
538 rxrpc_put_message(msg);
539 goto finished_msg;
540 }
541
542 rxrpc_put_message(msg);
543 }
544
545 goto finished_msg;
546
547 /* dispose of the packets */
548 finished_msg:
549 while (!list_empty(&msgq)) {
550 msg = list_entry(msgq.next, struct rxrpc_message, link);
551 list_del_init(&msg->link);
552
553 rxrpc_put_message(msg);
554 }
555 kfree_skb(pkt);
556 }
557
558 _leave("");
559
560} /* end rxrpc_trans_receive_packet() */
561
562/*****************************************************************************/
563/*
564 * accept a new call from a client trying to connect to one of my services
565 * - called in process context
566 */
567static int rxrpc_trans_receive_new_call(struct rxrpc_transport *trans,
568 struct list_head *msgq)
569{
570 struct rxrpc_message *msg;
571
572 _enter("");
573
574 /* only bother with the first packet */
575 msg = list_entry(msgq->next, struct rxrpc_message, link);
576 list_del_init(&msg->link);
577 rxrpc_krxsecd_queue_incoming_call(msg);
578 rxrpc_put_message(msg);
579
580 _leave(" = 0");
581
582 return 0;
583} /* end rxrpc_trans_receive_new_call() */
584
585/*****************************************************************************/
586/*
587 * perform an immediate abort without connection or call structures
588 */
589int rxrpc_trans_immediate_abort(struct rxrpc_transport *trans,
590 struct rxrpc_message *msg,
591 int error)
592{
593 struct rxrpc_header ahdr;
594 struct sockaddr_in sin;
595 struct msghdr msghdr;
596 struct kvec iov[2];
597 __be32 _error;
598 int len, ret;
599
600 _enter("%p,%p,%d", trans, msg, error);
601
602 /* don't abort an abort packet */
603 if (msg->hdr.type == RXRPC_PACKET_TYPE_ABORT) {
604 _leave(" = 0");
605 return 0;
606 }
607
608 _error = htonl(-error);
609
610 /* set up the message to be transmitted */
611 memcpy(&ahdr, &msg->hdr, sizeof(ahdr));
612 ahdr.epoch = msg->hdr.epoch;
613 ahdr.serial = htonl(1);
614 ahdr.seq = 0;
615 ahdr.type = RXRPC_PACKET_TYPE_ABORT;
616 ahdr.flags = RXRPC_LAST_PACKET;
617 ahdr.flags |= ~msg->hdr.flags & RXRPC_CLIENT_INITIATED;
618
619 iov[0].iov_len = sizeof(ahdr);
620 iov[0].iov_base = &ahdr;
621 iov[1].iov_len = sizeof(_error);
622 iov[1].iov_base = &_error;
623
624 len = sizeof(ahdr) + sizeof(_error);
625
626 memset(&sin,0,sizeof(sin));
627 sin.sin_family = AF_INET;
628 sin.sin_port = udp_hdr(msg->pkt)->source;
629 sin.sin_addr.s_addr = ip_hdr(msg->pkt)->saddr;
630
631 msghdr.msg_name = &sin;
632 msghdr.msg_namelen = sizeof(sin);
633 msghdr.msg_control = NULL;
634 msghdr.msg_controllen = 0;
635 msghdr.msg_flags = MSG_DONTWAIT;
636
637 _net("Sending message type %d of %d bytes to %08x:%d",
638 ahdr.type,
639 len,
640 ntohl(sin.sin_addr.s_addr),
641 ntohs(sin.sin_port));
642
643 /* send the message */
644 ret = kernel_sendmsg(trans->socket, &msghdr, iov, 2, len);
645
646 _leave(" = %d", ret);
647 return ret;
648} /* end rxrpc_trans_immediate_abort() */
649
650/*****************************************************************************/
651/*
652 * receive an ICMP error report and percolate it to all connections
653 * heading to the affected host or port
654 */
655static void rxrpc_trans_receive_error_report(struct rxrpc_transport *trans)
656{
657 struct rxrpc_connection *conn;
658 struct sockaddr_in sin;
659 struct rxrpc_peer *peer;
660 struct list_head connq, *_p;
661 struct errormsg emsg;
662 struct msghdr msg;
663 __be16 port;
664 int local, err;
665
666 _enter("%p", trans);
667
668 for (;;) {
669 trans->error_rcvd = 0;
670
671 /* try and receive an error message */
672 msg.msg_name = &sin;
673 msg.msg_namelen = sizeof(sin);
674 msg.msg_control = &emsg;
675 msg.msg_controllen = sizeof(emsg);
676 msg.msg_flags = 0;
677
678 err = kernel_recvmsg(trans->socket, &msg, NULL, 0, 0,
679 MSG_ERRQUEUE | MSG_DONTWAIT | MSG_TRUNC);
680
681 if (err == -EAGAIN) {
682 _leave("");
683 return;
684 }
685
686 if (err < 0) {
687 printk("%s: unable to recv an error report: %d\n",
688 __FUNCTION__, err);
689 _leave("");
690 return;
691 }
692
693 msg.msg_controllen = (char *) msg.msg_control - (char *) &emsg;
694
695 if (msg.msg_controllen < sizeof(emsg.cmsg) ||
696 msg.msg_namelen < sizeof(sin)) {
697 printk("%s: short control message"
698 " (nlen=%u clen=%Zu fl=%x)\n",
699 __FUNCTION__,
700 msg.msg_namelen,
701 msg.msg_controllen,
702 msg.msg_flags);
703 continue;
704 }
705
706 _net("Rx Received control message"
707 " { len=%Zu level=%u type=%u }",
708 emsg.cmsg.cmsg_len,
709 emsg.cmsg.cmsg_level,
710 emsg.cmsg.cmsg_type);
711
712 if (sin.sin_family != AF_INET) {
713 printk("Rx Ignoring error report with non-INET address"
714 " (fam=%u)",
715 sin.sin_family);
716 continue;
717 }
718
719 _net("Rx Received message pertaining to host addr=%x port=%hu",
720 ntohl(sin.sin_addr.s_addr), ntohs(sin.sin_port));
721
722 if (emsg.cmsg.cmsg_level != SOL_IP ||
723 emsg.cmsg.cmsg_type != IP_RECVERR) {
724 printk("Rx Ignoring unknown error report"
725 " { level=%u type=%u }",
726 emsg.cmsg.cmsg_level,
727 emsg.cmsg.cmsg_type);
728 continue;
729 }
730
731 if (msg.msg_controllen < sizeof(emsg.cmsg) + sizeof(emsg.ee)) {
732 printk("%s: short error message (%Zu)\n",
733 __FUNCTION__, msg.msg_controllen);
734 _leave("");
735 return;
736 }
737
738 port = sin.sin_port;
739
740 switch (emsg.ee.ee_origin) {
741 case SO_EE_ORIGIN_ICMP:
742 local = 0;
743 switch (emsg.ee.ee_type) {
744 case ICMP_DEST_UNREACH:
745 switch (emsg.ee.ee_code) {
746 case ICMP_NET_UNREACH:
747 _net("Rx Received ICMP Network Unreachable");
748 port = 0;
749 err = -ENETUNREACH;
750 break;
751 case ICMP_HOST_UNREACH:
752 _net("Rx Received ICMP Host Unreachable");
753 port = 0;
754 err = -EHOSTUNREACH;
755 break;
756 case ICMP_PORT_UNREACH:
757 _net("Rx Received ICMP Port Unreachable");
758 err = -ECONNREFUSED;
759 break;
760 case ICMP_NET_UNKNOWN:
761 _net("Rx Received ICMP Unknown Network");
762 port = 0;
763 err = -ENETUNREACH;
764 break;
765 case ICMP_HOST_UNKNOWN:
766 _net("Rx Received ICMP Unknown Host");
767 port = 0;
768 err = -EHOSTUNREACH;
769 break;
770 default:
771 _net("Rx Received ICMP DestUnreach { code=%u }",
772 emsg.ee.ee_code);
773 err = emsg.ee.ee_errno;
774 break;
775 }
776 break;
777
778 case ICMP_TIME_EXCEEDED:
779 _net("Rx Received ICMP TTL Exceeded");
780 err = emsg.ee.ee_errno;
781 break;
782
783 default:
784 _proto("Rx Received ICMP error { type=%u code=%u }",
785 emsg.ee.ee_type, emsg.ee.ee_code);
786 err = emsg.ee.ee_errno;
787 break;
788 }
789 break;
790
791 case SO_EE_ORIGIN_LOCAL:
792 _proto("Rx Received local error { error=%d }",
793 emsg.ee.ee_errno);
794 local = 1;
795 err = emsg.ee.ee_errno;
796 break;
797
798 case SO_EE_ORIGIN_NONE:
799 case SO_EE_ORIGIN_ICMP6:
800 default:
801 _proto("Rx Received error report { orig=%u }",
802 emsg.ee.ee_origin);
803 local = 0;
804 err = emsg.ee.ee_errno;
805 break;
806 }
807
808 /* find all the connections between this transport and the
809 * affected destination */
810 INIT_LIST_HEAD(&connq);
811
812 if (rxrpc_peer_lookup(trans, sin.sin_addr.s_addr,
813 &peer) == 0) {
814 read_lock(&peer->conn_lock);
815 list_for_each(_p, &peer->conn_active) {
816 conn = list_entry(_p, struct rxrpc_connection,
817 link);
818 if (port && conn->addr.sin_port != port)
819 continue;
820 if (!list_empty(&conn->err_link))
821 continue;
822
823 rxrpc_get_connection(conn);
824 list_add_tail(&conn->err_link, &connq);
825 }
826 read_unlock(&peer->conn_lock);
827
828 /* service all those connections */
829 while (!list_empty(&connq)) {
830 conn = list_entry(connq.next,
831 struct rxrpc_connection,
832 err_link);
833 list_del(&conn->err_link);
834
835 rxrpc_conn_handle_error(conn, local, err);
836
837 rxrpc_put_connection(conn);
838 }
839
840 rxrpc_put_peer(peer);
841 }
842 }
843
844 _leave("");
845 return;
846} /* end rxrpc_trans_receive_error_report() */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-12 14:24:38 -0500