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