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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 rxrpc_set_call_completion(call, compl,
177 conn->abort_code,
178 conn->error);
179 }
180 }
181
182 spin_unlock(&conn->channel_lock);
183 _leave("");
184}
185
186/*
187 * generate a connection-level abort
188 */
189static int rxrpc_abort_connection(struct rxrpc_connection *conn,
190 int error, u32 abort_code)
191{
192 struct rxrpc_wire_header whdr;
193 struct msghdr msg;
194 struct kvec iov[2];
195 __be32 word;
196 size_t len;
197 u32 serial;
198 int ret;
199
200 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
201
202 /* generate a connection-level abort */
203 spin_lock_bh(&conn->state_lock);
204 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
205 spin_unlock_bh(&conn->state_lock);
206 _leave(" = 0 [already dead]");
207 return 0;
208 }
209
210 conn->error = error;
211 conn->abort_code = abort_code;
212 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
213 spin_unlock_bh(&conn->state_lock);
214
215 msg.msg_name = &conn->params.peer->srx.transport;
216 msg.msg_namelen = conn->params.peer->srx.transport_len;
217 msg.msg_control = NULL;
218 msg.msg_controllen = 0;
219 msg.msg_flags = 0;
220
221 whdr.epoch = htonl(conn->proto.epoch);
222 whdr.cid = htonl(conn->proto.cid);
223 whdr.callNumber = 0;
224 whdr.seq = 0;
225 whdr.type = RXRPC_PACKET_TYPE_ABORT;
226 whdr.flags = conn->out_clientflag;
227 whdr.userStatus = 0;
228 whdr.securityIndex = conn->security_ix;
229 whdr._rsvd = 0;
230 whdr.serviceId = htons(conn->service_id);
231
232 word = htonl(conn->abort_code);
233
234 iov[0].iov_base = &whdr;
235 iov[0].iov_len = sizeof(whdr);
236 iov[1].iov_base = &word;
237 iov[1].iov_len = sizeof(word);
238
239 len = iov[0].iov_len + iov[1].iov_len;
240
241 serial = atomic_inc_return(&conn->serial);
242 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, serial);
243 whdr.serial = htonl(serial);
244 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->abort_code);
245
246 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
247 if (ret < 0) {
248 trace_rxrpc_tx_fail(conn->debug_id, serial, ret,
249 rxrpc_tx_point_conn_abort);
250 _debug("sendmsg failed: %d", ret);
251 return -EAGAIN;
252 }
253
254 trace_rxrpc_tx_packet(conn->debug_id, &whdr, rxrpc_tx_point_conn_abort);
255
256 conn->params.peer->last_tx_at = ktime_get_seconds();
257
258 _leave(" = 0");
259 return 0;
260}
261
262/*
263 * mark a call as being on a now-secured channel
264 * - must be called with BH's disabled.
265 */
266static void rxrpc_call_is_secure(struct rxrpc_call *call)
267{
268 _enter("%p", call);
269 if (call) {
270 write_lock_bh(&call->state_lock);
271 if (call->state == RXRPC_CALL_SERVER_SECURING) {
272 call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
273 rxrpc_notify_socket(call);
274 }
275 write_unlock_bh(&call->state_lock);
276 }
277}
278
279/*
280 * connection-level Rx packet processor
281 */
282static int rxrpc_process_event(struct rxrpc_connection *conn,
283 struct sk_buff *skb,
284 u32 *_abort_code)
285{
286 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
287 __be32 wtmp;
288 u32 abort_code;
289 int loop, ret;
290
291 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
292 _leave(" = -ECONNABORTED [%u]", conn->state);
293 return -ECONNABORTED;
294 }
295
296 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
297
298 switch (sp->hdr.type) {
299 case RXRPC_PACKET_TYPE_DATA:
300 case RXRPC_PACKET_TYPE_ACK:
301 rxrpc_conn_retransmit_call(conn, skb,
302 sp->hdr.cid & RXRPC_CHANNELMASK);
303 return 0;
304
305 case RXRPC_PACKET_TYPE_BUSY:
306 /* Just ignore BUSY packets for now. */
307 return 0;
308
309 case RXRPC_PACKET_TYPE_ABORT:
310 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
311 &wtmp, sizeof(wtmp)) < 0) {
312 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
313 tracepoint_string("bad_abort"));
314 return -EPROTO;
315 }
316 abort_code = ntohl(wtmp);
317 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
318
319 conn->error = -ECONNABORTED;
320 conn->abort_code = abort_code;
321 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
322 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED, sp->hdr.serial);
323 return -ECONNABORTED;
324
325 case RXRPC_PACKET_TYPE_CHALLENGE:
326 return conn->security->respond_to_challenge(conn, skb,
327 _abort_code);
328
329 case RXRPC_PACKET_TYPE_RESPONSE:
330 ret = conn->security->verify_response(conn, skb, _abort_code);
331 if (ret < 0)
332 return ret;
333
334 ret = conn->security->init_connection_security(conn);
335 if (ret < 0)
336 return ret;
337
338 ret = conn->security->prime_packet_security(conn);
339 if (ret < 0)
340 return ret;
341
342 spin_lock(&conn->channel_lock);
343 spin_lock_bh(&conn->state_lock);
344
345 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
346 conn->state = RXRPC_CONN_SERVICE;
347 spin_unlock_bh(&conn->state_lock);
348 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
349 rxrpc_call_is_secure(
350 rcu_dereference_protected(
351 conn->channels[loop].call,
352 lockdep_is_held(&conn->channel_lock)));
353 } else {
354 spin_unlock_bh(&conn->state_lock);
355 }
356
357 spin_unlock(&conn->channel_lock);
358 return 0;
359
360 default:
361 trace_rxrpc_rx_eproto(NULL, sp->hdr.serial,
362 tracepoint_string("bad_conn_pkt"));
363 return -EPROTO;
364 }
365}
366
367/*
368 * set up security and issue a challenge
369 */
370static void rxrpc_secure_connection(struct rxrpc_connection *conn)
371{
372 u32 abort_code;
373 int ret;
374
375 _enter("{%d}", conn->debug_id);
376
377 ASSERT(conn->security_ix != 0);
378 ASSERT(conn->server_key);
379
380 if (conn->security->issue_challenge(conn) < 0) {
381 abort_code = RX_CALL_DEAD;
382 ret = -ENOMEM;
383 goto abort;
384 }
385
386 _leave("");
387 return;
388
389abort:
390 _debug("abort %d, %d", ret, abort_code);
391 rxrpc_abort_connection(conn, ret, abort_code);
392 _leave(" [aborted]");
393}
394
395/*
396 * Process delayed final ACKs that we haven't subsumed into a subsequent call.
397 */
398static void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn)
399{
400 unsigned long j = jiffies, next_j;
401 unsigned int channel;
402 bool set;
403
404again:
405 next_j = j + LONG_MAX;
406 set = false;
407 for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
408 struct rxrpc_channel *chan = &conn->channels[channel];
409 unsigned long ack_at;
410
411 if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
412 continue;
413
414 smp_rmb(); /* vs rxrpc_disconnect_client_call */
415 ack_at = READ_ONCE(chan->final_ack_at);
416
417 if (time_before(j, ack_at)) {
418 if (time_before(ack_at, next_j)) {
419 next_j = ack_at;
420 set = true;
421 }
422 continue;
423 }
424
425 if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
426 &conn->flags))
427 rxrpc_conn_retransmit_call(conn, NULL, channel);
428 }
429
430 j = jiffies;
431 if (time_before_eq(next_j, j))
432 goto again;
433 if (set)
434 rxrpc_reduce_conn_timer(conn, next_j);
435}
436
437/*
438 * connection-level event processor
439 */
440static void rxrpc_do_process_connection(struct rxrpc_connection *conn)
441{
442 struct sk_buff *skb;
443 u32 abort_code = RX_PROTOCOL_ERROR;
444 int ret;
445
446 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
447 rxrpc_secure_connection(conn);
448
449 /* Process delayed ACKs whose time has come. */
450 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
451 rxrpc_process_delayed_final_acks(conn);
452
453 /* go through the conn-level event packets, releasing the ref on this
454 * connection that each one has when we've finished with it */
455 while ((skb = skb_dequeue(&conn->rx_queue))) {
456 rxrpc_see_skb(skb, rxrpc_skb_seen);
457 ret = rxrpc_process_event(conn, skb, &abort_code);
458 switch (ret) {
459 case -EPROTO:
460 case -EKEYEXPIRED:
461 case -EKEYREJECTED:
462 goto protocol_error;
463 case -ENOMEM:
464 case -EAGAIN:
465 goto requeue_and_leave;
466 case -ECONNABORTED:
467 default:
468 rxrpc_free_skb(skb, rxrpc_skb_freed);
469 break;
470 }
471 }
472
473 return;
474
475requeue_and_leave:
476 skb_queue_head(&conn->rx_queue, skb);
477 return;
478
479protocol_error:
480 if (rxrpc_abort_connection(conn, ret, abort_code) < 0)
481 goto requeue_and_leave;
482 rxrpc_free_skb(skb, rxrpc_skb_freed);
483 return;
484}
485
486void rxrpc_process_connection(struct work_struct *work)
487{
488 struct rxrpc_connection *conn =
489 container_of(work, struct rxrpc_connection, processor);
490
491 rxrpc_see_connection(conn);
492
493 if (__rxrpc_use_local(conn->params.local)) {
494 rxrpc_do_process_connection(conn);
495 rxrpc_unuse_local(conn->params.local);
496 }
497
498 rxrpc_put_connection(conn);
499 _leave("");
500 return;
501}
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 * Set the completion state on an aborted connection.
21 */
22static bool rxrpc_set_conn_aborted(struct rxrpc_connection *conn, struct sk_buff *skb,
23 s32 abort_code, int err,
24 enum rxrpc_call_completion compl)
25{
26 bool aborted = false;
27
28 if (conn->state != RXRPC_CONN_ABORTED) {
29 spin_lock(&conn->state_lock);
30 if (conn->state != RXRPC_CONN_ABORTED) {
31 conn->abort_code = abort_code;
32 conn->error = err;
33 conn->completion = compl;
34 /* Order the abort info before the state change. */
35 smp_store_release(&conn->state, RXRPC_CONN_ABORTED);
36 set_bit(RXRPC_CONN_DONT_REUSE, &conn->flags);
37 set_bit(RXRPC_CONN_EV_ABORT_CALLS, &conn->events);
38 aborted = true;
39 }
40 spin_unlock(&conn->state_lock);
41 }
42
43 return aborted;
44}
45
46/*
47 * Mark a socket buffer to indicate that the connection it's on should be aborted.
48 */
49int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
50 s32 abort_code, int err, enum rxrpc_abort_reason why)
51{
52 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
53
54 if (rxrpc_set_conn_aborted(conn, skb, abort_code, err,
55 RXRPC_CALL_LOCALLY_ABORTED)) {
56 trace_rxrpc_abort(0, why, sp->hdr.cid, sp->hdr.callNumber,
57 sp->hdr.seq, abort_code, err);
58 rxrpc_poke_conn(conn, rxrpc_conn_get_poke_abort);
59 }
60 return -EPROTO;
61}
62
63/*
64 * Mark a connection as being remotely aborted.
65 */
66static bool rxrpc_input_conn_abort(struct rxrpc_connection *conn,
67 struct sk_buff *skb)
68{
69 return rxrpc_set_conn_aborted(conn, skb, skb->priority, -ECONNABORTED,
70 RXRPC_CALL_REMOTELY_ABORTED);
71}
72
73/*
74 * Retransmit terminal ACK or ABORT of the previous call.
75 */
76void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn,
77 struct sk_buff *skb,
78 unsigned int channel)
79{
80 struct rxrpc_skb_priv *sp = skb ? rxrpc_skb(skb) : NULL;
81 struct rxrpc_channel *chan;
82 struct msghdr msg;
83 struct kvec iov[3];
84 struct {
85 struct rxrpc_wire_header whdr;
86 union {
87 __be32 abort_code;
88 struct rxrpc_ackpacket ack;
89 };
90 } __attribute__((packed)) pkt;
91 struct rxrpc_acktrailer trailer;
92 size_t len;
93 int ret, ioc;
94 u32 serial, mtu, call_id, padding;
95
96 _enter("%d", conn->debug_id);
97
98 if (sp && sp->hdr.type == RXRPC_PACKET_TYPE_ACK) {
99 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
100 &pkt.ack, sizeof(pkt.ack)) < 0)
101 return;
102 if (pkt.ack.reason == RXRPC_ACK_PING_RESPONSE)
103 return;
104 }
105
106 chan = &conn->channels[channel];
107
108 /* If the last call got moved on whilst we were waiting to run, just
109 * ignore this packet.
110 */
111 call_id = chan->last_call;
112 if (skb && call_id != sp->hdr.callNumber)
113 return;
114
115 msg.msg_name = &conn->peer->srx.transport;
116 msg.msg_namelen = conn->peer->srx.transport_len;
117 msg.msg_control = NULL;
118 msg.msg_controllen = 0;
119 msg.msg_flags = 0;
120
121 iov[0].iov_base = &pkt;
122 iov[0].iov_len = sizeof(pkt.whdr);
123 iov[1].iov_base = &padding;
124 iov[1].iov_len = 3;
125 iov[2].iov_base = &trailer;
126 iov[2].iov_len = sizeof(trailer);
127
128 serial = rxrpc_get_next_serial(conn);
129
130 pkt.whdr.epoch = htonl(conn->proto.epoch);
131 pkt.whdr.cid = htonl(conn->proto.cid | channel);
132 pkt.whdr.callNumber = htonl(call_id);
133 pkt.whdr.serial = htonl(serial);
134 pkt.whdr.seq = 0;
135 pkt.whdr.type = chan->last_type;
136 pkt.whdr.flags = conn->out_clientflag;
137 pkt.whdr.userStatus = 0;
138 pkt.whdr.securityIndex = conn->security_ix;
139 pkt.whdr._rsvd = 0;
140 pkt.whdr.serviceId = htons(conn->service_id);
141
142 len = sizeof(pkt.whdr);
143 switch (chan->last_type) {
144 case RXRPC_PACKET_TYPE_ABORT:
145 pkt.abort_code = htonl(chan->last_abort);
146 iov[0].iov_len += sizeof(pkt.abort_code);
147 len += sizeof(pkt.abort_code);
148 ioc = 1;
149 break;
150
151 case RXRPC_PACKET_TYPE_ACK:
152 mtu = conn->peer->if_mtu;
153 mtu -= conn->peer->hdrsize;
154 pkt.ack.bufferSpace = 0;
155 pkt.ack.maxSkew = htons(skb ? skb->priority : 0);
156 pkt.ack.firstPacket = htonl(chan->last_seq + 1);
157 pkt.ack.previousPacket = htonl(chan->last_seq);
158 pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0);
159 pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
160 pkt.ack.nAcks = 0;
161 trailer.maxMTU = htonl(rxrpc_rx_mtu);
162 trailer.ifMTU = htonl(mtu);
163 trailer.rwind = htonl(rxrpc_rx_window_size);
164 trailer.jumbo_max = htonl(rxrpc_rx_jumbo_max);
165 pkt.whdr.flags |= RXRPC_SLOW_START_OK;
166 padding = 0;
167 iov[0].iov_len += sizeof(pkt.ack);
168 len += sizeof(pkt.ack) + 3 + sizeof(trailer);
169 ioc = 3;
170
171 trace_rxrpc_tx_ack(chan->call_debug_id, serial,
172 ntohl(pkt.ack.firstPacket),
173 ntohl(pkt.ack.serial),
174 pkt.ack.reason, 0, rxrpc_rx_window_size);
175 break;
176
177 default:
178 return;
179 }
180
181 ret = kernel_sendmsg(conn->local->socket, &msg, iov, ioc, len);
182 conn->peer->last_tx_at = ktime_get_seconds();
183 if (ret < 0)
184 trace_rxrpc_tx_fail(chan->call_debug_id, serial, ret,
185 rxrpc_tx_point_call_final_resend);
186 else
187 trace_rxrpc_tx_packet(chan->call_debug_id, &pkt.whdr,
188 rxrpc_tx_point_call_final_resend);
189
190 _leave("");
191}
192
193/*
194 * pass a connection-level abort onto all calls on that connection
195 */
196static void rxrpc_abort_calls(struct rxrpc_connection *conn)
197{
198 struct rxrpc_call *call;
199 int i;
200
201 _enter("{%d},%x", conn->debug_id, conn->abort_code);
202
203 for (i = 0; i < RXRPC_MAXCALLS; i++) {
204 call = conn->channels[i].call;
205 if (call)
206 rxrpc_set_call_completion(call,
207 conn->completion,
208 conn->abort_code,
209 conn->error);
210 }
211
212 _leave("");
213}
214
215/*
216 * mark a call as being on a now-secured channel
217 * - must be called with BH's disabled.
218 */
219static void rxrpc_call_is_secure(struct rxrpc_call *call)
220{
221 if (call && __rxrpc_call_state(call) == RXRPC_CALL_SERVER_SECURING) {
222 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
223 rxrpc_notify_socket(call);
224 }
225}
226
227/*
228 * connection-level Rx packet processor
229 */
230static int rxrpc_process_event(struct rxrpc_connection *conn,
231 struct sk_buff *skb)
232{
233 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
234 int ret;
235
236 if (conn->state == RXRPC_CONN_ABORTED)
237 return -ECONNABORTED;
238
239 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
240
241 switch (sp->hdr.type) {
242 case RXRPC_PACKET_TYPE_CHALLENGE:
243 return conn->security->respond_to_challenge(conn, skb);
244
245 case RXRPC_PACKET_TYPE_RESPONSE:
246 ret = conn->security->verify_response(conn, skb);
247 if (ret < 0)
248 return ret;
249
250 ret = conn->security->init_connection_security(
251 conn, conn->key->payload.data[0]);
252 if (ret < 0)
253 return ret;
254
255 spin_lock(&conn->state_lock);
256 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING)
257 conn->state = RXRPC_CONN_SERVICE;
258 spin_unlock(&conn->state_lock);
259
260 if (conn->state == RXRPC_CONN_SERVICE) {
261 /* Offload call state flipping to the I/O thread. As
262 * we've already received the packet, put it on the
263 * front of the queue.
264 */
265 skb->mark = RXRPC_SKB_MARK_SERVICE_CONN_SECURED;
266 rxrpc_get_skb(skb, rxrpc_skb_get_conn_secured);
267 skb_queue_head(&conn->local->rx_queue, skb);
268 rxrpc_wake_up_io_thread(conn->local);
269 }
270 return 0;
271
272 default:
273 WARN_ON_ONCE(1);
274 return -EPROTO;
275 }
276}
277
278/*
279 * set up security and issue a challenge
280 */
281static void rxrpc_secure_connection(struct rxrpc_connection *conn)
282{
283 if (conn->security->issue_challenge(conn) < 0)
284 rxrpc_abort_conn(conn, NULL, RX_CALL_DEAD, -ENOMEM,
285 rxrpc_abort_nomem);
286}
287
288/*
289 * Process delayed final ACKs that we haven't subsumed into a subsequent call.
290 */
291void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn, bool force)
292{
293 unsigned long j = jiffies, next_j;
294 unsigned int channel;
295 bool set;
296
297again:
298 next_j = j + LONG_MAX;
299 set = false;
300 for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
301 struct rxrpc_channel *chan = &conn->channels[channel];
302 unsigned long ack_at;
303
304 if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
305 continue;
306
307 ack_at = chan->final_ack_at;
308 if (time_before(j, ack_at) && !force) {
309 if (time_before(ack_at, next_j)) {
310 next_j = ack_at;
311 set = true;
312 }
313 continue;
314 }
315
316 if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
317 &conn->flags))
318 rxrpc_conn_retransmit_call(conn, NULL, channel);
319 }
320
321 j = jiffies;
322 if (time_before_eq(next_j, j))
323 goto again;
324 if (set)
325 rxrpc_reduce_conn_timer(conn, next_j);
326}
327
328/*
329 * connection-level event processor
330 */
331static void rxrpc_do_process_connection(struct rxrpc_connection *conn)
332{
333 struct sk_buff *skb;
334 int ret;
335
336 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
337 rxrpc_secure_connection(conn);
338
339 /* go through the conn-level event packets, releasing the ref on this
340 * connection that each one has when we've finished with it */
341 while ((skb = skb_dequeue(&conn->rx_queue))) {
342 rxrpc_see_skb(skb, rxrpc_skb_see_conn_work);
343 ret = rxrpc_process_event(conn, skb);
344 switch (ret) {
345 case -ENOMEM:
346 case -EAGAIN:
347 skb_queue_head(&conn->rx_queue, skb);
348 rxrpc_queue_conn(conn, rxrpc_conn_queue_retry_work);
349 break;
350 default:
351 rxrpc_free_skb(skb, rxrpc_skb_put_conn_work);
352 break;
353 }
354 }
355}
356
357void rxrpc_process_connection(struct work_struct *work)
358{
359 struct rxrpc_connection *conn =
360 container_of(work, struct rxrpc_connection, processor);
361
362 rxrpc_see_connection(conn, rxrpc_conn_see_work);
363
364 if (__rxrpc_use_local(conn->local, rxrpc_local_use_conn_work)) {
365 rxrpc_do_process_connection(conn);
366 rxrpc_unuse_local(conn->local, rxrpc_local_unuse_conn_work);
367 }
368}
369
370/*
371 * post connection-level events to the connection
372 * - this includes challenges, responses, some aborts and call terminal packet
373 * retransmission.
374 */
375static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
376 struct sk_buff *skb)
377{
378 _enter("%p,%p", conn, skb);
379
380 rxrpc_get_skb(skb, rxrpc_skb_get_conn_work);
381 skb_queue_tail(&conn->rx_queue, skb);
382 rxrpc_queue_conn(conn, rxrpc_conn_queue_rx_work);
383}
384
385/*
386 * Input a connection-level packet.
387 */
388bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb)
389{
390 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
391
392 switch (sp->hdr.type) {
393 case RXRPC_PACKET_TYPE_BUSY:
394 /* Just ignore BUSY packets for now. */
395 return true;
396
397 case RXRPC_PACKET_TYPE_ABORT:
398 if (rxrpc_is_conn_aborted(conn))
399 return true;
400 rxrpc_input_conn_abort(conn, skb);
401 rxrpc_abort_calls(conn);
402 return true;
403
404 case RXRPC_PACKET_TYPE_CHALLENGE:
405 case RXRPC_PACKET_TYPE_RESPONSE:
406 if (rxrpc_is_conn_aborted(conn)) {
407 if (conn->completion == RXRPC_CALL_LOCALLY_ABORTED)
408 rxrpc_send_conn_abort(conn);
409 return true;
410 }
411 rxrpc_post_packet_to_conn(conn, skb);
412 return true;
413
414 default:
415 WARN_ON_ONCE(1);
416 return true;
417 }
418}
419
420/*
421 * Input a connection event.
422 */
423void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb)
424{
425 unsigned int loop;
426
427 if (test_and_clear_bit(RXRPC_CONN_EV_ABORT_CALLS, &conn->events))
428 rxrpc_abort_calls(conn);
429
430 switch (skb->mark) {
431 case RXRPC_SKB_MARK_SERVICE_CONN_SECURED:
432 if (conn->state != RXRPC_CONN_SERVICE)
433 break;
434
435 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
436 rxrpc_call_is_secure(conn->channels[loop].call);
437 break;
438 }
439
440 /* Process delayed ACKs whose time has come. */
441 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
442 rxrpc_process_delayed_final_acks(conn, false);
443}