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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* connection-level event handling
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/net.h>
12#include <linux/skbuff.h>
13#include <linux/errqueue.h>
14#include <net/sock.h>
15#include <net/af_rxrpc.h>
16#include <net/ip.h>
17#include "ar-internal.h"
18
19/*
20 * Retransmit terminal ACK or ABORT of the previous call.
21 */
22static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
23 struct sk_buff *skb,
24 unsigned int channel)
25{
26 struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
27 struct rxrpc_channel *chan;
28 struct msghdr msg;
29 struct kvec iov[3];
30 struct {
31 struct rxrpc_wire_header whdr;
32 union {
33 __be32 abort_code;
34 struct rxrpc_ackpacket ack;
35 };
36 } __attribute__((packed)) pkt;
37 struct rxrpc_ackinfo ack_info;
38 size_t len;
39 int ret, ioc;
40 u32 serial, mtu, call_id, padding;
41
42 _enter("%d", conn->debug_id);
43
44 chan = &conn->channels[channel];
45
46 /* If the last call got moved on whilst we were waiting to run, just
47 * ignore this packet.
48 */
49 call_id = READ_ONCE(chan->last_call);
50 /* Sync with __rxrpc_disconnect_call() */
51 smp_rmb();
52 if (skb && call_id != sp->hdr.callNumber)
53 return;
54
55 msg.msg_name = &conn->params.peer->srx.transport;
56 msg.msg_namelen = conn->params.peer->srx.transport_len;
57 msg.msg_control = NULL;
58 msg.msg_controllen = 0;
59 msg.msg_flags = 0;
60
61 iov[0].iov_base = &pkt;
62 iov[0].iov_len = sizeof(pkt.whdr);
63 iov[1].iov_base = &padding;
64 iov[1].iov_len = 3;
65 iov[2].iov_base = &ack_info;
66 iov[2].iov_len = sizeof(ack_info);
67
68 pkt.whdr.epoch = htonl(conn->proto.epoch);
69 pkt.whdr.cid = htonl(conn->proto.cid | channel);
70 pkt.whdr.callNumber = htonl(call_id);
71 pkt.whdr.seq = 0;
72 pkt.whdr.type = chan->last_type;
73 pkt.whdr.flags = conn->out_clientflag;
74 pkt.whdr.userStatus = 0;
75 pkt.whdr.securityIndex = conn->security_ix;
76 pkt.whdr._rsvd = 0;
77 pkt.whdr.serviceId = htons(conn->service_id);
78
79 len = sizeof(pkt.whdr);
80 switch (chan->last_type) {
81 case RXRPC_PACKET_TYPE_ABORT:
82 pkt.abort_code = htonl(chan->last_abort);
83 iov[0].iov_len += sizeof(pkt.abort_code);
84 len += sizeof(pkt.abort_code);
85 ioc = 1;
86 break;
87
88 case RXRPC_PACKET_TYPE_ACK:
89 mtu = conn->params.peer->if_mtu;
90 mtu -= conn->params.peer->hdrsize;
91 pkt.ack.bufferSpace = 0;
92 pkt.ack.maxSkew = htons(skb ? skb->priority : 0);
93 pkt.ack.firstPacket = htonl(chan->last_seq + 1);
94 pkt.ack.previousPacket = htonl(chan->last_seq);
95 pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0);
96 pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
97 pkt.ack.nAcks = 0;
98 ack_info.rxMTU = htonl(rxrpc_rx_mtu);
99 ack_info.maxMTU = htonl(mtu);
100 ack_info.rwind = htonl(rxrpc_rx_window_size);
101 ack_info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
102 pkt.whdr.flags |= RXRPC_SLOW_START_OK;
103 padding = 0;
104 iov[0].iov_len += sizeof(pkt.ack);
105 len += sizeof(pkt.ack) + 3 + sizeof(ack_info);
106 ioc = 3;
107 break;
108
109 default:
110 return;
111 }
112
113 /* Resync with __rxrpc_disconnect_call() and check that the last call
114 * didn't get advanced whilst we were filling out the packets.
115 */
116 smp_rmb();
117 if (READ_ONCE(chan->last_call) != call_id)
118 return;
119
120 serial = atomic_inc_return(&conn->serial);
121 pkt.whdr.serial = htonl(serial);
122
123 switch (chan->last_type) {
124 case RXRPC_PACKET_TYPE_ABORT:
125 _proto("Tx ABORT %%%u { %d } [re]", serial, conn->abort_code);
126 break;
127 case RXRPC_PACKET_TYPE_ACK:
128 trace_rxrpc_tx_ack(chan->call_debug_id, serial,
129 ntohl(pkt.ack.firstPacket),
130 ntohl(pkt.ack.serial),
131 pkt.ack.reason, 0);
132 _proto("Tx ACK %%%u [re]", serial);
133 break;
134 }
135
136 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, ioc, len);
137 conn->params.peer->last_tx_at = ktime_get_seconds();
138 if (ret < 0)
139 trace_rxrpc_tx_fail(chan->call_debug_id, serial, ret,
140 rxrpc_tx_point_call_final_resend);
141 else
142 trace_rxrpc_tx_packet(chan->call_debug_id, &pkt.whdr,
143 rxrpc_tx_point_call_final_resend);
144
145 _leave("");
146}
147
148/*
149 * pass a connection-level abort onto all calls on that connection
150 */
151static void rxrpc_abort_calls(struct rxrpc_connection *conn,
152 enum rxrpc_call_completion compl,
153 rxrpc_serial_t serial)
154{
155 struct rxrpc_call *call;
156 int i;
157
158 _enter("{%d},%x", conn->debug_id, conn->abort_code);
159
160 spin_lock(&conn->channel_lock);
161
162 for (i = 0; i < RXRPC_MAXCALLS; i++) {
163 call = rcu_dereference_protected(
164 conn->channels[i].call,
165 lockdep_is_held(&conn->channel_lock));
166 if (call) {
167 if (compl == RXRPC_CALL_LOCALLY_ABORTED)
168 trace_rxrpc_abort(call->debug_id,
169 "CON", call->cid,
170 call->call_id, 0,
171 conn->abort_code,
172 conn->error);
173 else
174 trace_rxrpc_rx_abort(call, serial,
175 conn->abort_code);
176 if (rxrpc_set_call_completion(call, compl,
177 conn->abort_code,
178 conn->error))
179 rxrpc_notify_socket(call);
180 }
181 }
182
183 spin_unlock(&conn->channel_lock);
184 _leave("");
185}
186
187/*
188 * generate a connection-level abort
189 */
190static int rxrpc_abort_connection(struct rxrpc_connection *conn,
191 int error, u32 abort_code)
192{
193 struct rxrpc_wire_header whdr;
194 struct msghdr msg;
195 struct kvec iov[2];
196 __be32 word;
197 size_t len;
198 u32 serial;
199 int ret;
200
201 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
202
203 /* generate a connection-level abort */
204 spin_lock_bh(&conn->state_lock);
205 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
206 spin_unlock_bh(&conn->state_lock);
207 _leave(" = 0 [already dead]");
208 return 0;
209 }
210
211 conn->error = error;
212 conn->abort_code = abort_code;
213 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
214 spin_unlock_bh(&conn->state_lock);
215
216 msg.msg_name = &conn->params.peer->srx.transport;
217 msg.msg_namelen = conn->params.peer->srx.transport_len;
218 msg.msg_control = NULL;
219 msg.msg_controllen = 0;
220 msg.msg_flags = 0;
221
222 whdr.epoch = htonl(conn->proto.epoch);
223 whdr.cid = htonl(conn->proto.cid);
224 whdr.callNumber = 0;
225 whdr.seq = 0;
226 whdr.type = RXRPC_PACKET_TYPE_ABORT;
227 whdr.flags = conn->out_clientflag;
228 whdr.userStatus = 0;
229 whdr.securityIndex = conn->security_ix;
230 whdr._rsvd = 0;
231 whdr.serviceId = htons(conn->service_id);
232
233 word = htonl(conn->abort_code);
234
235 iov[0].iov_base = &whdr;
236 iov[0].iov_len = sizeof(whdr);
237 iov[1].iov_base = &word;
238 iov[1].iov_len = sizeof(word);
239
240 len = iov[0].iov_len + iov[1].iov_len;
241
242 serial = atomic_inc_return(&conn->serial);
243 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, serial);
244 whdr.serial = htonl(serial);
245 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->abort_code);
246
247 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
248 if (ret < 0) {
249 trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
250 rxrpc_tx_point_conn_abort);
251 _debug("sendmsg failed: %d", ret);
252 return -EAGAIN;
253 }
254
255 trace_rxrpc_tx_packet(conn->debug_id, &whdr, rxrpc_tx_point_conn_abort);
256
257 conn->params.peer->last_tx_at = ktime_get_seconds();
258
259 _leave(" = 0");
260 return 0;
261}
262
263/*
264 * mark a call as being on a now-secured channel
265 * - must be called with BH's disabled.
266 */
267static void rxrpc_call_is_secure(struct rxrpc_call *call)
268{
269 _enter("%p", call);
270 if (call) {
271 write_lock_bh(&call->state_lock);
272 if (call->state == RXRPC_CALL_SERVER_SECURING) {
273 call->state = RXRPC_CALL_SERVER_ACCEPTING;
274 rxrpc_notify_socket(call);
275 }
276 write_unlock_bh(&call->state_lock);
277 }
278}
279
280/*
281 * connection-level Rx packet processor
282 */
283static int rxrpc_process_event(struct rxrpc_connection *conn,
284 struct sk_buff *skb,
285 u32 *_abort_code)
286{
287 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
288 __be32 wtmp;
289 u32 abort_code;
290 int loop, ret;
291
292 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
293 _leave(" = -ECONNABORTED [%u]", conn->state);
294 return -ECONNABORTED;
295 }
296
297 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
298
299 switch (sp->hdr.type) {
300 case RXRPC_PACKET_TYPE_DATA:
301 case RXRPC_PACKET_TYPE_ACK:
302 rxrpc_conn_retransmit_call(conn, skb,
303 sp->hdr.cid & RXRPC_CHANNELMASK);
304 return 0;
305
306 case RXRPC_PACKET_TYPE_BUSY:
307 /* Just ignore BUSY packets for now. */
308 return 0;
309
310 case RXRPC_PACKET_TYPE_ABORT:
311 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
312 &wtmp, sizeof(wtmp)) < 0) {
313 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
314 tracepoint_string("bad_abort"));
315 return -EPROTO;
316 }
317 abort_code = ntohl(wtmp);
318 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
319
320 conn->error = -ECONNABORTED;
321 conn->abort_code = abort_code;
322 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
323 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, sp->hdr.serial);
324 return -ECONNABORTED;
325
326 case RXRPC_PACKET_TYPE_CHALLENGE:
327 return conn->security->respond_to_challenge(conn, skb,
328 _abort_code);
329
330 case RXRPC_PACKET_TYPE_RESPONSE:
331 ret = conn->security->verify_response(conn, skb, _abort_code);
332 if (ret < 0)
333 return ret;
334
335 ret = conn->security->init_connection_security(conn);
336 if (ret < 0)
337 return ret;
338
339 ret = conn->security->prime_packet_security(conn);
340 if (ret < 0)
341 return ret;
342
343 spin_lock(&conn->channel_lock);
344 spin_lock(&conn->state_lock);
345
346 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
347 conn->state = RXRPC_CONN_SERVICE;
348 spin_unlock(&conn->state_lock);
349 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
350 rxrpc_call_is_secure(
351 rcu_dereference_protected(
352 conn->channels[loop].call,
353 lockdep_is_held(&conn->channel_lock)));
354 } else {
355 spin_unlock(&conn->state_lock);
356 }
357
358 spin_unlock(&conn->channel_lock);
359 return 0;
360
361 default:
362 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
363 tracepoint_string("bad_conn_pkt"));
364 return -EPROTO;
365 }
366}
367
368/*
369 * set up security and issue a challenge
370 */
371static void rxrpc_secure_connection(struct rxrpc_connection *conn)
372{
373 u32 abort_code;
374 int ret;
375
376 _enter("{%d}", conn->debug_id);
377
378 ASSERT(conn->security_ix != 0);
379
380 if (!conn->params.key) {
381 _debug("set up security");
382 ret = rxrpc_init_server_conn_security(conn);
383 switch (ret) {
384 case 0:
385 break;
386 case -ENOENT:
387 abort_code = RX_CALL_DEAD;
388 goto abort;
389 default:
390 abort_code = RXKADNOAUTH;
391 goto abort;
392 }
393 }
394
395 if (conn->security->issue_challenge(conn) < 0) {
396 abort_code = RX_CALL_DEAD;
397 ret = -ENOMEM;
398 goto abort;
399 }
400
401 _leave("");
402 return;
403
404abort:
405 _debug("abort %d, %d", ret, abort_code);
406 rxrpc_abort_connection(conn, ret, abort_code);
407 _leave(" [aborted]");
408}
409
410/*
411 * Process delayed final ACKs that we haven't subsumed into a subsequent call.
412 */
413static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
414{
415 unsigned long j = jiffies, next_j;
416 unsigned int channel;
417 bool set;
418
419again:
420 next_j = j + LONG_MAX;
421 set = false;
422 for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
423 struct rxrpc_channel *chan = &conn->channels[channel];
424 unsigned long ack_at;
425
426 if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
427 continue;
428
429 smp_rmb(); /* vs rxrpc_disconnect_client_call */
430 ack_at = READ_ONCE(chan->final_ack_at);
431
432 if (time_before(j, ack_at)) {
433 if (time_before(ack_at, next_j)) {
434 next_j = ack_at;
435 set = true;
436 }
437 continue;
438 }
439
440 if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
441 &conn->flags))
442 rxrpc_conn_retransmit_call(conn, NULL, channel);
443 }
444
445 j = jiffies;
446 if (time_before_eq(next_j, j))
447 goto again;
448 if (set)
449 rxrpc_reduce_conn_timer(conn, next_j);
450}
451
452/*
453 * connection-level event processor
454 */
455void rxrpc_process_connection(struct work_struct *work)
456{
457 struct rxrpc_connection *conn =
458 container_of(work, struct rxrpc_connection, processor);
459 struct sk_buff *skb;
460 u32 abort_code = RX_PROTOCOL_ERROR;
461 int ret;
462
463 rxrpc_see_connection(conn);
464
465 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
466 rxrpc_secure_connection(conn);
467
468 /* Process delayed ACKs whose time has come. */
469 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
470 rxrpc_process_delayed_final_acks(conn);
471
472 /* go through the conn-level event packets, releasing the ref on this
473 * connection that each one has when we've finished with it */
474 while ((skb = skb_dequeue(&conn->rx_queue))) {
475 rxrpc_see_skb(skb, rxrpc_skb_seen);
476 ret = rxrpc_process_event(conn, skb, &abort_code);
477 switch (ret) {
478 case -EPROTO:
479 case -EKEYEXPIRED:
480 case -EKEYREJECTED:
481 goto protocol_error;
482 case -ENOMEM:
483 case -EAGAIN:
484 goto requeue_and_leave;
485 case -ECONNABORTED:
486 default:
487 rxrpc_free_skb(skb, rxrpc_skb_freed);
488 break;
489 }
490 }
491
492out:
493 rxrpc_put_connection(conn);
494 _leave("");
495 return;
496
497requeue_and_leave:
498 skb_queue_head(&conn->rx_queue, skb);
499 goto out;
500
501protocol_error:
502 if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
503 goto requeue_and_leave;
504 rxrpc_free_skb(skb, rxrpc_skb_freed);
505 goto out;
506}
1/* connection-level event handling
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/module.h>
15#include <linux/net.h>
16#include <linux/skbuff.h>
17#include <linux/errqueue.h>
18#include <net/sock.h>
19#include <net/af_rxrpc.h>
20#include <net/ip.h>
21#include "ar-internal.h"
22
23/*
24 * Retransmit terminal ACK or ABORT of the previous call.
25 */
26static void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
27 struct sk_buff *skb,
28 unsigned int channel)
29{
30 struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
31 struct rxrpc_channel *chan;
32 struct msghdr msg;
33 struct kvec iov[3];
34 struct {
35 struct rxrpc_wire_header whdr;
36 union {
37 __be32 abort_code;
38 struct rxrpc_ackpacket ack;
39 };
40 } __attribute__((packed)) pkt;
41 struct rxrpc_ackinfo ack_info;
42 size_t len;
43 int ret, ioc;
44 u32 serial, mtu, call_id, padding;
45
46 _enter("%d", conn->debug_id);
47
48 chan = &conn->channels[channel];
49
50 /* If the last call got moved on whilst we were waiting to run, just
51 * ignore this packet.
52 */
53 call_id = READ_ONCE(chan->last_call);
54 /* Sync with __rxrpc_disconnect_call() */
55 smp_rmb();
56 if (skb && call_id != sp->hdr.callNumber)
57 return;
58
59 msg.msg_name = &conn->params.peer->srx.transport;
60 msg.msg_namelen = conn->params.peer->srx.transport_len;
61 msg.msg_control = NULL;
62 msg.msg_controllen = 0;
63 msg.msg_flags = 0;
64
65 iov[0].iov_base = &pkt;
66 iov[0].iov_len = sizeof(pkt.whdr);
67 iov[1].iov_base = &padding;
68 iov[1].iov_len = 3;
69 iov[2].iov_base = &ack_info;
70 iov[2].iov_len = sizeof(ack_info);
71
72 pkt.whdr.epoch = htonl(conn->proto.epoch);
73 pkt.whdr.cid = htonl(conn->proto.cid);
74 pkt.whdr.callNumber = htonl(call_id);
75 pkt.whdr.seq = 0;
76 pkt.whdr.type = chan->last_type;
77 pkt.whdr.flags = conn->out_clientflag;
78 pkt.whdr.userStatus = 0;
79 pkt.whdr.securityIndex = conn->security_ix;
80 pkt.whdr._rsvd = 0;
81 pkt.whdr.serviceId = htons(conn->service_id);
82
83 len = sizeof(pkt.whdr);
84 switch (chan->last_type) {
85 case RXRPC_PACKET_TYPE_ABORT:
86 pkt.abort_code = htonl(chan->last_abort);
87 iov[0].iov_len += sizeof(pkt.abort_code);
88 len += sizeof(pkt.abort_code);
89 ioc = 1;
90 break;
91
92 case RXRPC_PACKET_TYPE_ACK:
93 mtu = conn->params.peer->if_mtu;
94 mtu -= conn->params.peer->hdrsize;
95 pkt.ack.bufferSpace = 0;
96 pkt.ack.maxSkew = htons(skb ? skb->priority : 0);
97 pkt.ack.firstPacket = htonl(chan->last_seq + 1);
98 pkt.ack.previousPacket = htonl(chan->last_seq);
99 pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0);
100 pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
101 pkt.ack.nAcks = 0;
102 ack_info.rxMTU = htonl(rxrpc_rx_mtu);
103 ack_info.maxMTU = htonl(mtu);
104 ack_info.rwind = htonl(rxrpc_rx_window_size);
105 ack_info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
106 pkt.whdr.flags |= RXRPC_SLOW_START_OK;
107 padding = 0;
108 iov[0].iov_len += sizeof(pkt.ack);
109 len += sizeof(pkt.ack) + 3 + sizeof(ack_info);
110 ioc = 3;
111 break;
112
113 default:
114 return;
115 }
116
117 /* Resync with __rxrpc_disconnect_call() and check that the last call
118 * didn't get advanced whilst we were filling out the packets.
119 */
120 smp_rmb();
121 if (READ_ONCE(chan->last_call) != call_id)
122 return;
123
124 serial = atomic_inc_return(&conn->serial);
125 pkt.whdr.serial = htonl(serial);
126
127 switch (chan->last_type) {
128 case RXRPC_PACKET_TYPE_ABORT:
129 _proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
130 break;
131 case RXRPC_PACKET_TYPE_ACK:
132 trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0,
133 RXRPC_ACK_DUPLICATE, 0);
134 _proto("Tx ACK %%%u [re]", serial);
135 break;
136 }
137
138 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, ioc, len);
139 conn->params.peer->last_tx_at = ktime_get_real();
140 if (ret < 0)
141 trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
142 rxrpc_tx_fail_call_final_resend);
143
144 _leave("");
145}
146
147/*
148 * pass a connection-level abort onto all calls on that connection
149 */
150static void rxrpc_abort_calls(struct rxrpc_connection *conn,
151 enum rxrpc_call_completion compl,
152 u32 abort_code, int error)
153{
154 struct rxrpc_call *call;
155 int i;
156
157 _enter("{%d},%x", conn->debug_id, abort_code);
158
159 spin_lock(&conn->channel_lock);
160
161 for (i = 0; i < RXRPC_MAXCALLS; i++) {
162 call = rcu_dereference_protected(
163 conn->channels[i].call,
164 lockdep_is_held(&conn->channel_lock));
165 if (call) {
166 if (compl == RXRPC_CALL_LOCALLY_ABORTED)
167 trace_rxrpc_abort(call->debug_id,
168 "CON", call->cid,
169 call->call_id, 0,
170 abort_code, error);
171 if (rxrpc_set_call_completion(call, compl,
172 abort_code, error))
173 rxrpc_notify_socket(call);
174 }
175 }
176
177 spin_unlock(&conn->channel_lock);
178 _leave("");
179}
180
181/*
182 * generate a connection-level abort
183 */
184static int rxrpc_abort_connection(struct rxrpc_connection *conn,
185 int error, u32 abort_code)
186{
187 struct rxrpc_wire_header whdr;
188 struct msghdr msg;
189 struct kvec iov[2];
190 __be32 word;
191 size_t len;
192 u32 serial;
193 int ret;
194
195 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
196
197 /* generate a connection-level abort */
198 spin_lock_bh(&conn->state_lock);
199 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
200 spin_unlock_bh(&conn->state_lock);
201 _leave(" = 0 [already dead]");
202 return 0;
203 }
204
205 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
206 spin_unlock_bh(&conn->state_lock);
207
208 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
209
210 msg.msg_name = &conn->params.peer->srx.transport;
211 msg.msg_namelen = conn->params.peer->srx.transport_len;
212 msg.msg_control = NULL;
213 msg.msg_controllen = 0;
214 msg.msg_flags = 0;
215
216 whdr.epoch = htonl(conn->proto.epoch);
217 whdr.cid = htonl(conn->proto.cid);
218 whdr.callNumber = 0;
219 whdr.seq = 0;
220 whdr.type = RXRPC_PACKET_TYPE_ABORT;
221 whdr.flags = conn->out_clientflag;
222 whdr.userStatus = 0;
223 whdr.securityIndex = conn->security_ix;
224 whdr._rsvd = 0;
225 whdr.serviceId = htons(conn->service_id);
226
227 word = htonl(conn->local_abort);
228
229 iov[0].iov_base = &whdr;
230 iov[0].iov_len = sizeof(whdr);
231 iov[1].iov_base = &word;
232 iov[1].iov_len = sizeof(word);
233
234 len = iov[0].iov_len + iov[1].iov_len;
235
236 serial = atomic_inc_return(&conn->serial);
237 whdr.serial = htonl(serial);
238 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
239
240 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
241 if (ret < 0) {
242 trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
243 rxrpc_tx_fail_conn_abort);
244 _debug("sendmsg failed: %d", ret);
245 return -EAGAIN;
246 }
247
248 conn->params.peer->last_tx_at = ktime_get_real();
249
250 _leave(" = 0");
251 return 0;
252}
253
254/*
255 * mark a call as being on a now-secured channel
256 * - must be called with BH's disabled.
257 */
258static void rxrpc_call_is_secure(struct rxrpc_call *call)
259{
260 _enter("%p", call);
261 if (call) {
262 write_lock_bh(&call->state_lock);
263 if (call->state == RXRPC_CALL_SERVER_SECURING) {
264 call->state = RXRPC_CALL_SERVER_ACCEPTING;
265 rxrpc_notify_socket(call);
266 }
267 write_unlock_bh(&call->state_lock);
268 }
269}
270
271/*
272 * connection-level Rx packet processor
273 */
274static int rxrpc_process_event(struct rxrpc_connection *conn,
275 struct sk_buff *skb,
276 u32 *_abort_code)
277{
278 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
279 __be32 wtmp;
280 u32 abort_code;
281 int loop, ret;
282
283 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
284 _leave(" = -ECONNABORTED [%u]", conn->state);
285 return -ECONNABORTED;
286 }
287
288 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
289
290 switch (sp->hdr.type) {
291 case RXRPC_PACKET_TYPE_DATA:
292 case RXRPC_PACKET_TYPE_ACK:
293 rxrpc_conn_retransmit_call(conn, skb,
294 sp->hdr.cid & RXRPC_CHANNELMASK);
295 return 0;
296
297 case RXRPC_PACKET_TYPE_BUSY:
298 /* Just ignore BUSY packets for now. */
299 return 0;
300
301 case RXRPC_PACKET_TYPE_ABORT:
302 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
303 &wtmp, sizeof(wtmp)) < 0) {
304 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
305 tracepoint_string("bad_abort"));
306 return -EPROTO;
307 }
308 abort_code = ntohl(wtmp);
309 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
310
311 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
312 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
313 abort_code, -ECONNABORTED);
314 return -ECONNABORTED;
315
316 case RXRPC_PACKET_TYPE_CHALLENGE:
317 return conn->security->respond_to_challenge(conn, skb,
318 _abort_code);
319
320 case RXRPC_PACKET_TYPE_RESPONSE:
321 ret = conn->security->verify_response(conn, skb, _abort_code);
322 if (ret < 0)
323 return ret;
324
325 ret = conn->security->init_connection_security(conn);
326 if (ret < 0)
327 return ret;
328
329 ret = conn->security->prime_packet_security(conn);
330 if (ret < 0)
331 return ret;
332
333 spin_lock(&conn->channel_lock);
334 spin_lock(&conn->state_lock);
335
336 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
337 conn->state = RXRPC_CONN_SERVICE;
338 spin_unlock(&conn->state_lock);
339 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
340 rxrpc_call_is_secure(
341 rcu_dereference_protected(
342 conn->channels[loop].call,
343 lockdep_is_held(&conn->channel_lock)));
344 } else {
345 spin_unlock(&conn->state_lock);
346 }
347
348 spin_unlock(&conn->channel_lock);
349 return 0;
350
351 default:
352 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
353 tracepoint_string("bad_conn_pkt"));
354 return -EPROTO;
355 }
356}
357
358/*
359 * set up security and issue a challenge
360 */
361static void rxrpc_secure_connection(struct rxrpc_connection *conn)
362{
363 u32 abort_code;
364 int ret;
365
366 _enter("{%d}", conn->debug_id);
367
368 ASSERT(conn->security_ix != 0);
369
370 if (!conn->params.key) {
371 _debug("set up security");
372 ret = rxrpc_init_server_conn_security(conn);
373 switch (ret) {
374 case 0:
375 break;
376 case -ENOENT:
377 abort_code = RX_CALL_DEAD;
378 goto abort;
379 default:
380 abort_code = RXKADNOAUTH;
381 goto abort;
382 }
383 }
384
385 if (conn->security->issue_challenge(conn) < 0) {
386 abort_code = RX_CALL_DEAD;
387 ret = -ENOMEM;
388 goto abort;
389 }
390
391 _leave("");
392 return;
393
394abort:
395 _debug("abort %d, %d", ret, abort_code);
396 rxrpc_abort_connection(conn, ret, abort_code);
397 _leave(" [aborted]");
398}
399
400/*
401 * Process delayed final ACKs that we haven't subsumed into a subsequent call.
402 */
403static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
404{
405 unsigned long j = jiffies, next_j;
406 unsigned int channel;
407 bool set;
408
409again:
410 next_j = j + LONG_MAX;
411 set = false;
412 for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
413 struct rxrpc_channel *chan = &conn->channels[channel];
414 unsigned long ack_at;
415
416 if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
417 continue;
418
419 smp_rmb(); /* vs rxrpc_disconnect_client_call */
420 ack_at = READ_ONCE(chan->final_ack_at);
421
422 if (time_before(j, ack_at)) {
423 if (time_before(ack_at, next_j)) {
424 next_j = ack_at;
425 set = true;
426 }
427 continue;
428 }
429
430 if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
431 &conn->flags))
432 rxrpc_conn_retransmit_call(conn, NULL, channel);
433 }
434
435 j = jiffies;
436 if (time_before_eq(next_j, j))
437 goto again;
438 if (set)
439 rxrpc_reduce_conn_timer(conn, next_j);
440}
441
442/*
443 * connection-level event processor
444 */
445void rxrpc_process_connection(struct work_struct *work)
446{
447 struct rxrpc_connection *conn =
448 container_of(work, struct rxrpc_connection, processor);
449 struct sk_buff *skb;
450 u32 abort_code = RX_PROTOCOL_ERROR;
451 int ret;
452
453 rxrpc_see_connection(conn);
454
455 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
456 rxrpc_secure_connection(conn);
457
458 /* Process delayed ACKs whose time has come. */
459 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
460 rxrpc_process_delayed_final_acks(conn);
461
462 /* go through the conn-level event packets, releasing the ref on this
463 * connection that each one has when we've finished with it */
464 while ((skb = skb_dequeue(&conn->rx_queue))) {
465 rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
466 ret = rxrpc_process_event(conn, skb, &abort_code);
467 switch (ret) {
468 case -EPROTO:
469 case -EKEYEXPIRED:
470 case -EKEYREJECTED:
471 goto protocol_error;
472 case -ENOMEM:
473 case -EAGAIN:
474 goto requeue_and_leave;
475 case -ECONNABORTED:
476 default:
477 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
478 break;
479 }
480 }
481
482out:
483 rxrpc_put_connection(conn);
484 _leave("");
485 return;
486
487requeue_and_leave:
488 skb_queue_head(&conn->rx_queue, skb);
489 goto out;
490
491protocol_error:
492 if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
493 goto requeue_and_leave;
494 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
495 goto out;
496}