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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 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_ackinfo ack_info;
92 size_t len;
93 int ret, ioc;
94 u32 serial, mtu, call_id, padding;
95
96 _enter("%d", conn->debug_id);
97
98 chan = &conn->channels[channel];
99
100 /* If the last call got moved on whilst we were waiting to run, just
101 * ignore this packet.
102 */
103 call_id = chan->last_call;
104 if (skb && call_id != sp->hdr.callNumber)
105 return;
106
107 msg.msg_name = &conn->peer->srx.transport;
108 msg.msg_namelen = conn->peer->srx.transport_len;
109 msg.msg_control = NULL;
110 msg.msg_controllen = 0;
111 msg.msg_flags = 0;
112
113 iov[0].iov_base = &pkt;
114 iov[0].iov_len = sizeof(pkt.whdr);
115 iov[1].iov_base = &padding;
116 iov[1].iov_len = 3;
117 iov[2].iov_base = &ack_info;
118 iov[2].iov_len = sizeof(ack_info);
119
120 serial = atomic_inc_return(&conn->serial);
121
122 pkt.whdr.epoch = htonl(conn->proto.epoch);
123 pkt.whdr.cid = htonl(conn->proto.cid | channel);
124 pkt.whdr.callNumber = htonl(call_id);
125 pkt.whdr.serial = htonl(serial);
126 pkt.whdr.seq = 0;
127 pkt.whdr.type = chan->last_type;
128 pkt.whdr.flags = conn->out_clientflag;
129 pkt.whdr.userStatus = 0;
130 pkt.whdr.securityIndex = conn->security_ix;
131 pkt.whdr._rsvd = 0;
132 pkt.whdr.serviceId = htons(conn->service_id);
133
134 len = sizeof(pkt.whdr);
135 switch (chan->last_type) {
136 case RXRPC_PACKET_TYPE_ABORT:
137 pkt.abort_code = htonl(chan->last_abort);
138 iov[0].iov_len += sizeof(pkt.abort_code);
139 len += sizeof(pkt.abort_code);
140 ioc = 1;
141 break;
142
143 case RXRPC_PACKET_TYPE_ACK:
144 mtu = conn->peer->if_mtu;
145 mtu -= conn->peer->hdrsize;
146 pkt.ack.bufferSpace = 0;
147 pkt.ack.maxSkew = htons(skb ? skb->priority : 0);
148 pkt.ack.firstPacket = htonl(chan->last_seq + 1);
149 pkt.ack.previousPacket = htonl(chan->last_seq);
150 pkt.ack.serial = htonl(skb ? sp->hdr.serial : 0);
151 pkt.ack.reason = skb ? RXRPC_ACK_DUPLICATE : RXRPC_ACK_IDLE;
152 pkt.ack.nAcks = 0;
153 ack_info.rxMTU = htonl(rxrpc_rx_mtu);
154 ack_info.maxMTU = htonl(mtu);
155 ack_info.rwind = htonl(rxrpc_rx_window_size);
156 ack_info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
157 pkt.whdr.flags |= RXRPC_SLOW_START_OK;
158 padding = 0;
159 iov[0].iov_len += sizeof(pkt.ack);
160 len += sizeof(pkt.ack) + 3 + sizeof(ack_info);
161 ioc = 3;
162
163 trace_rxrpc_tx_ack(chan->call_debug_id, serial,
164 ntohl(pkt.ack.firstPacket),
165 ntohl(pkt.ack.serial),
166 pkt.ack.reason, 0);
167 break;
168
169 default:
170 return;
171 }
172
173 ret = kernel_sendmsg(conn->local->socket, &msg, iov, ioc, len);
174 conn->peer->last_tx_at = ktime_get_seconds();
175 if (ret < 0)
176 trace_rxrpc_tx_fail(chan->call_debug_id, serial, ret,
177 rxrpc_tx_point_call_final_resend);
178 else
179 trace_rxrpc_tx_packet(chan->call_debug_id, &pkt.whdr,
180 rxrpc_tx_point_call_final_resend);
181
182 _leave("");
183}
184
185/*
186 * pass a connection-level abort onto all calls on that connection
187 */
188static void rxrpc_abort_calls(struct rxrpc_connection *conn)
189{
190 struct rxrpc_call *call;
191 int i;
192
193 _enter("{%d},%x", conn->debug_id, conn->abort_code);
194
195 for (i = 0; i < RXRPC_MAXCALLS; i++) {
196 call = conn->channels[i].call;
197 if (call)
198 rxrpc_set_call_completion(call,
199 conn->completion,
200 conn->abort_code,
201 conn->error);
202 }
203
204 _leave("");
205}
206
207/*
208 * mark a call as being on a now-secured channel
209 * - must be called with BH's disabled.
210 */
211static void rxrpc_call_is_secure(struct rxrpc_call *call)
212{
213 if (call && __rxrpc_call_state(call) == RXRPC_CALL_SERVER_SECURING) {
214 rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST);
215 rxrpc_notify_socket(call);
216 }
217}
218
219/*
220 * connection-level Rx packet processor
221 */
222static int rxrpc_process_event(struct rxrpc_connection *conn,
223 struct sk_buff *skb)
224{
225 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
226 int ret;
227
228 if (conn->state == RXRPC_CONN_ABORTED)
229 return -ECONNABORTED;
230
231 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
232
233 switch (sp->hdr.type) {
234 case RXRPC_PACKET_TYPE_CHALLENGE:
235 return conn->security->respond_to_challenge(conn, skb);
236
237 case RXRPC_PACKET_TYPE_RESPONSE:
238 ret = conn->security->verify_response(conn, skb);
239 if (ret < 0)
240 return ret;
241
242 ret = conn->security->init_connection_security(
243 conn, conn->key->payload.data[0]);
244 if (ret < 0)
245 return ret;
246
247 spin_lock(&conn->state_lock);
248 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING)
249 conn->state = RXRPC_CONN_SERVICE;
250 spin_unlock(&conn->state_lock);
251
252 if (conn->state == RXRPC_CONN_SERVICE) {
253 /* Offload call state flipping to the I/O thread. As
254 * we've already received the packet, put it on the
255 * front of the queue.
256 */
257 skb->mark = RXRPC_SKB_MARK_SERVICE_CONN_SECURED;
258 rxrpc_get_skb(skb, rxrpc_skb_get_conn_secured);
259 skb_queue_head(&conn->local->rx_queue, skb);
260 rxrpc_wake_up_io_thread(conn->local);
261 }
262 return 0;
263
264 default:
265 WARN_ON_ONCE(1);
266 return -EPROTO;
267 }
268}
269
270/*
271 * set up security and issue a challenge
272 */
273static void rxrpc_secure_connection(struct rxrpc_connection *conn)
274{
275 if (conn->security->issue_challenge(conn) < 0)
276 rxrpc_abort_conn(conn, NULL, RX_CALL_DEAD, -ENOMEM,
277 rxrpc_abort_nomem);
278}
279
280/*
281 * Process delayed final ACKs that we haven't subsumed into a subsequent call.
282 */
283void rxrpc_process_delayed_final_acks(struct rxrpc_connection *conn, bool force)
284{
285 unsigned long j = jiffies, next_j;
286 unsigned int channel;
287 bool set;
288
289again:
290 next_j = j + LONG_MAX;
291 set = false;
292 for (channel = 0; channel < RXRPC_MAXCALLS; channel++) {
293 struct rxrpc_channel *chan = &conn->channels[channel];
294 unsigned long ack_at;
295
296 if (!test_bit(RXRPC_CONN_FINAL_ACK_0 + channel, &conn->flags))
297 continue;
298
299 ack_at = chan->final_ack_at;
300 if (time_before(j, ack_at) && !force) {
301 if (time_before(ack_at, next_j)) {
302 next_j = ack_at;
303 set = true;
304 }
305 continue;
306 }
307
308 if (test_and_clear_bit(RXRPC_CONN_FINAL_ACK_0 + channel,
309 &conn->flags))
310 rxrpc_conn_retransmit_call(conn, NULL, channel);
311 }
312
313 j = jiffies;
314 if (time_before_eq(next_j, j))
315 goto again;
316 if (set)
317 rxrpc_reduce_conn_timer(conn, next_j);
318}
319
320/*
321 * connection-level event processor
322 */
323static void rxrpc_do_process_connection(struct rxrpc_connection *conn)
324{
325 struct sk_buff *skb;
326 int ret;
327
328 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
329 rxrpc_secure_connection(conn);
330
331 /* go through the conn-level event packets, releasing the ref on this
332 * connection that each one has when we've finished with it */
333 while ((skb = skb_dequeue(&conn->rx_queue))) {
334 rxrpc_see_skb(skb, rxrpc_skb_see_conn_work);
335 ret = rxrpc_process_event(conn, skb);
336 switch (ret) {
337 case -ENOMEM:
338 case -EAGAIN:
339 skb_queue_head(&conn->rx_queue, skb);
340 rxrpc_queue_conn(conn, rxrpc_conn_queue_retry_work);
341 break;
342 default:
343 rxrpc_free_skb(skb, rxrpc_skb_put_conn_work);
344 break;
345 }
346 }
347}
348
349void rxrpc_process_connection(struct work_struct *work)
350{
351 struct rxrpc_connection *conn =
352 container_of(work, struct rxrpc_connection, processor);
353
354 rxrpc_see_connection(conn, rxrpc_conn_see_work);
355
356 if (__rxrpc_use_local(conn->local, rxrpc_local_use_conn_work)) {
357 rxrpc_do_process_connection(conn);
358 rxrpc_unuse_local(conn->local, rxrpc_local_unuse_conn_work);
359 }
360}
361
362/*
363 * post connection-level events to the connection
364 * - this includes challenges, responses, some aborts and call terminal packet
365 * retransmission.
366 */
367static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn,
368 struct sk_buff *skb)
369{
370 _enter("%p,%p", conn, skb);
371
372 rxrpc_get_skb(skb, rxrpc_skb_get_conn_work);
373 skb_queue_tail(&conn->rx_queue, skb);
374 rxrpc_queue_conn(conn, rxrpc_conn_queue_rx_work);
375}
376
377/*
378 * Input a connection-level packet.
379 */
380bool rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb)
381{
382 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
383
384 switch (sp->hdr.type) {
385 case RXRPC_PACKET_TYPE_BUSY:
386 /* Just ignore BUSY packets for now. */
387 return true;
388
389 case RXRPC_PACKET_TYPE_ABORT:
390 if (rxrpc_is_conn_aborted(conn))
391 return true;
392 rxrpc_input_conn_abort(conn, skb);
393 rxrpc_abort_calls(conn);
394 return true;
395
396 case RXRPC_PACKET_TYPE_CHALLENGE:
397 case RXRPC_PACKET_TYPE_RESPONSE:
398 if (rxrpc_is_conn_aborted(conn)) {
399 if (conn->completion == RXRPC_CALL_LOCALLY_ABORTED)
400 rxrpc_send_conn_abort(conn);
401 return true;
402 }
403 rxrpc_post_packet_to_conn(conn, skb);
404 return true;
405
406 default:
407 WARN_ON_ONCE(1);
408 return true;
409 }
410}
411
412/*
413 * Input a connection event.
414 */
415void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb)
416{
417 unsigned int loop;
418
419 if (test_and_clear_bit(RXRPC_CONN_EV_ABORT_CALLS, &conn->events))
420 rxrpc_abort_calls(conn);
421
422 switch (skb->mark) {
423 case RXRPC_SKB_MARK_SERVICE_CONN_SECURED:
424 if (conn->state != RXRPC_CONN_SERVICE)
425 break;
426
427 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
428 rxrpc_call_is_secure(conn->channels[loop].call);
429 break;
430 }
431
432 /* Process delayed ACKs whose time has come. */
433 if (conn->flags & RXRPC_CONN_FINAL_ACK_MASK)
434 rxrpc_process_delayed_final_acks(conn, false);
435}
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{
29 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
30 struct rxrpc_channel *chan;
31 struct msghdr msg;
32 struct kvec iov;
33 struct {
34 struct rxrpc_wire_header whdr;
35 union {
36 struct {
37 __be32 code;
38 } abort;
39 struct {
40 struct rxrpc_ackpacket ack;
41 u8 padding[3];
42 struct rxrpc_ackinfo info;
43 };
44 };
45 } __attribute__((packed)) pkt;
46 size_t len;
47 u32 serial, mtu, call_id;
48
49 _enter("%d", conn->debug_id);
50
51 chan = &conn->channels[sp->hdr.cid & RXRPC_CHANNELMASK];
52
53 /* If the last call got moved on whilst we were waiting to run, just
54 * ignore this packet.
55 */
56 call_id = READ_ONCE(chan->last_call);
57 /* Sync with __rxrpc_disconnect_call() */
58 smp_rmb();
59 if (call_id != sp->hdr.callNumber)
60 return;
61
62 msg.msg_name = &conn->params.peer->srx.transport;
63 msg.msg_namelen = conn->params.peer->srx.transport_len;
64 msg.msg_control = NULL;
65 msg.msg_controllen = 0;
66 msg.msg_flags = 0;
67
68 pkt.whdr.epoch = htonl(sp->hdr.epoch);
69 pkt.whdr.cid = htonl(sp->hdr.cid);
70 pkt.whdr.callNumber = htonl(sp->hdr.callNumber);
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(chan->last_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 len += sizeof(pkt.abort);
84 break;
85
86 case RXRPC_PACKET_TYPE_ACK:
87 mtu = conn->params.peer->if_mtu;
88 mtu -= conn->params.peer->hdrsize;
89 pkt.ack.bufferSpace = 0;
90 pkt.ack.maxSkew = htons(skb->priority);
91 pkt.ack.firstPacket = htonl(chan->last_seq);
92 pkt.ack.previousPacket = htonl(chan->last_seq - 1);
93 pkt.ack.serial = htonl(sp->hdr.serial);
94 pkt.ack.reason = RXRPC_ACK_DUPLICATE;
95 pkt.ack.nAcks = 0;
96 pkt.info.rxMTU = htonl(rxrpc_rx_mtu);
97 pkt.info.maxMTU = htonl(mtu);
98 pkt.info.rwind = htonl(rxrpc_rx_window_size);
99 pkt.info.jumbo_max = htonl(rxrpc_rx_jumbo_max);
100 pkt.whdr.flags |= RXRPC_SLOW_START_OK;
101 len += sizeof(pkt.ack) + sizeof(pkt.info);
102 break;
103 }
104
105 /* Resync with __rxrpc_disconnect_call() and check that the last call
106 * didn't get advanced whilst we were filling out the packets.
107 */
108 smp_rmb();
109 if (READ_ONCE(chan->last_call) != call_id)
110 return;
111
112 iov.iov_base = &pkt;
113 iov.iov_len = len;
114
115 serial = atomic_inc_return(&conn->serial);
116 pkt.whdr.serial = htonl(serial);
117
118 switch (chan->last_type) {
119 case RXRPC_PACKET_TYPE_ABORT:
120 _proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
121 break;
122 case RXRPC_PACKET_TYPE_ACK:
123 trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0,
124 RXRPC_ACK_DUPLICATE, 0);
125 _proto("Tx ACK %%%u [re]", serial);
126 break;
127 }
128
129 kernel_sendmsg(conn->params.local->socket, &msg, &iov, 1, len);
130 _leave("");
131 return;
132}
133
134/*
135 * pass a connection-level abort onto all calls on that connection
136 */
137static void rxrpc_abort_calls(struct rxrpc_connection *conn,
138 enum rxrpc_call_completion compl,
139 u32 abort_code, int error)
140{
141 struct rxrpc_call *call;
142 int i;
143
144 _enter("{%d},%x", conn->debug_id, abort_code);
145
146 spin_lock(&conn->channel_lock);
147
148 for (i = 0; i < RXRPC_MAXCALLS; i++) {
149 call = rcu_dereference_protected(
150 conn->channels[i].call,
151 lockdep_is_held(&conn->channel_lock));
152 if (call) {
153 if (compl == RXRPC_CALL_LOCALLY_ABORTED)
154 trace_rxrpc_abort("CON", call->cid,
155 call->call_id, 0,
156 abort_code, error);
157 if (rxrpc_set_call_completion(call, compl,
158 abort_code, error))
159 rxrpc_notify_socket(call);
160 }
161 }
162
163 spin_unlock(&conn->channel_lock);
164 _leave("");
165}
166
167/*
168 * generate a connection-level abort
169 */
170static int rxrpc_abort_connection(struct rxrpc_connection *conn,
171 u32 error, u32 abort_code)
172{
173 struct rxrpc_wire_header whdr;
174 struct msghdr msg;
175 struct kvec iov[2];
176 __be32 word;
177 size_t len;
178 u32 serial;
179 int ret;
180
181 _enter("%d,,%u,%u", conn->debug_id, error, abort_code);
182
183 /* generate a connection-level abort */
184 spin_lock_bh(&conn->state_lock);
185 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
186 spin_unlock_bh(&conn->state_lock);
187 _leave(" = 0 [already dead]");
188 return 0;
189 }
190
191 conn->state = RXRPC_CONN_LOCALLY_ABORTED;
192 spin_unlock_bh(&conn->state_lock);
193
194 rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
195
196 msg.msg_name = &conn->params.peer->srx.transport;
197 msg.msg_namelen = conn->params.peer->srx.transport_len;
198 msg.msg_control = NULL;
199 msg.msg_controllen = 0;
200 msg.msg_flags = 0;
201
202 whdr.epoch = htonl(conn->proto.epoch);
203 whdr.cid = htonl(conn->proto.cid);
204 whdr.callNumber = 0;
205 whdr.seq = 0;
206 whdr.type = RXRPC_PACKET_TYPE_ABORT;
207 whdr.flags = conn->out_clientflag;
208 whdr.userStatus = 0;
209 whdr.securityIndex = conn->security_ix;
210 whdr._rsvd = 0;
211 whdr.serviceId = htons(conn->params.service_id);
212
213 word = htonl(conn->local_abort);
214
215 iov[0].iov_base = &whdr;
216 iov[0].iov_len = sizeof(whdr);
217 iov[1].iov_base = &word;
218 iov[1].iov_len = sizeof(word);
219
220 len = iov[0].iov_len + iov[1].iov_len;
221
222 serial = atomic_inc_return(&conn->serial);
223 whdr.serial = htonl(serial);
224 _proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
225
226 ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
227 if (ret < 0) {
228 _debug("sendmsg failed: %d", ret);
229 return -EAGAIN;
230 }
231
232 _leave(" = 0");
233 return 0;
234}
235
236/*
237 * mark a call as being on a now-secured channel
238 * - must be called with BH's disabled.
239 */
240static void rxrpc_call_is_secure(struct rxrpc_call *call)
241{
242 _enter("%p", call);
243 if (call) {
244 write_lock_bh(&call->state_lock);
245 if (call->state == RXRPC_CALL_SERVER_SECURING) {
246 call->state = RXRPC_CALL_SERVER_ACCEPTING;
247 rxrpc_notify_socket(call);
248 }
249 write_unlock_bh(&call->state_lock);
250 }
251}
252
253/*
254 * connection-level Rx packet processor
255 */
256static int rxrpc_process_event(struct rxrpc_connection *conn,
257 struct sk_buff *skb,
258 u32 *_abort_code)
259{
260 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
261 __be32 wtmp;
262 u32 abort_code;
263 int loop, ret;
264
265 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
266 _leave(" = -ECONNABORTED [%u]", conn->state);
267 return -ECONNABORTED;
268 }
269
270 _enter("{%d},{%u,%%%u},", conn->debug_id, sp->hdr.type, sp->hdr.serial);
271
272 switch (sp->hdr.type) {
273 case RXRPC_PACKET_TYPE_DATA:
274 case RXRPC_PACKET_TYPE_ACK:
275 rxrpc_conn_retransmit_call(conn, skb);
276 return 0;
277
278 case RXRPC_PACKET_TYPE_ABORT:
279 if (skb_copy_bits(skb, sizeof(struct rxrpc_wire_header),
280 &wtmp, sizeof(wtmp)) < 0)
281 return -EPROTO;
282 abort_code = ntohl(wtmp);
283 _proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
284
285 conn->state = RXRPC_CONN_REMOTELY_ABORTED;
286 rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
287 abort_code, ECONNABORTED);
288 return -ECONNABORTED;
289
290 case RXRPC_PACKET_TYPE_CHALLENGE:
291 return conn->security->respond_to_challenge(conn, skb,
292 _abort_code);
293
294 case RXRPC_PACKET_TYPE_RESPONSE:
295 ret = conn->security->verify_response(conn, skb, _abort_code);
296 if (ret < 0)
297 return ret;
298
299 ret = conn->security->init_connection_security(conn);
300 if (ret < 0)
301 return ret;
302
303 ret = conn->security->prime_packet_security(conn);
304 if (ret < 0)
305 return ret;
306
307 spin_lock(&conn->channel_lock);
308 spin_lock(&conn->state_lock);
309
310 if (conn->state == RXRPC_CONN_SERVICE_CHALLENGING) {
311 conn->state = RXRPC_CONN_SERVICE;
312 spin_unlock(&conn->state_lock);
313 for (loop = 0; loop < RXRPC_MAXCALLS; loop++)
314 rxrpc_call_is_secure(
315 rcu_dereference_protected(
316 conn->channels[loop].call,
317 lockdep_is_held(&conn->channel_lock)));
318 } else {
319 spin_unlock(&conn->state_lock);
320 }
321
322 spin_unlock(&conn->channel_lock);
323 return 0;
324
325 default:
326 _leave(" = -EPROTO [%u]", sp->hdr.type);
327 return -EPROTO;
328 }
329}
330
331/*
332 * set up security and issue a challenge
333 */
334static void rxrpc_secure_connection(struct rxrpc_connection *conn)
335{
336 u32 abort_code;
337 int ret;
338
339 _enter("{%d}", conn->debug_id);
340
341 ASSERT(conn->security_ix != 0);
342
343 if (!conn->params.key) {
344 _debug("set up security");
345 ret = rxrpc_init_server_conn_security(conn);
346 switch (ret) {
347 case 0:
348 break;
349 case -ENOENT:
350 abort_code = RX_CALL_DEAD;
351 goto abort;
352 default:
353 abort_code = RXKADNOAUTH;
354 goto abort;
355 }
356 }
357
358 if (conn->security->issue_challenge(conn) < 0) {
359 abort_code = RX_CALL_DEAD;
360 ret = -ENOMEM;
361 goto abort;
362 }
363
364 _leave("");
365 return;
366
367abort:
368 _debug("abort %d, %d", ret, abort_code);
369 rxrpc_abort_connection(conn, -ret, abort_code);
370 _leave(" [aborted]");
371}
372
373/*
374 * connection-level event processor
375 */
376void rxrpc_process_connection(struct work_struct *work)
377{
378 struct rxrpc_connection *conn =
379 container_of(work, struct rxrpc_connection, processor);
380 struct sk_buff *skb;
381 u32 abort_code = RX_PROTOCOL_ERROR;
382 int ret;
383
384 rxrpc_see_connection(conn);
385
386 if (test_and_clear_bit(RXRPC_CONN_EV_CHALLENGE, &conn->events))
387 rxrpc_secure_connection(conn);
388
389 /* go through the conn-level event packets, releasing the ref on this
390 * connection that each one has when we've finished with it */
391 while ((skb = skb_dequeue(&conn->rx_queue))) {
392 rxrpc_see_skb(skb, rxrpc_skb_rx_seen);
393 ret = rxrpc_process_event(conn, skb, &abort_code);
394 switch (ret) {
395 case -EPROTO:
396 case -EKEYEXPIRED:
397 case -EKEYREJECTED:
398 goto protocol_error;
399 case -EAGAIN:
400 goto requeue_and_leave;
401 case -ECONNABORTED:
402 default:
403 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
404 break;
405 }
406 }
407
408out:
409 rxrpc_put_connection(conn);
410 _leave("");
411 return;
412
413requeue_and_leave:
414 skb_queue_head(&conn->rx_queue, skb);
415 goto out;
416
417protocol_error:
418 if (rxrpc_abort_connection(conn, -ret, abort_code) < 0)
419 goto requeue_and_leave;
420 rxrpc_free_skb(skb, rxrpc_skb_rx_freed);
421 _leave(" [EPROTO]");
422 goto out;
423}