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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 * 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}
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}